5.1     Introduction  
This chapter covers internal MT1432BA memory (option) registers 
called S-Registers, where certain MT1432BA modem and Command mode 
configurations are stored. Each S-Register is assigned a number  
(S0, S1, S2, etc.). Use the S command to read and/or change the value 
stored in an S-Register (ATSr? to read and ATSr= to change S-Register 
values). Refer to Section 5.2, Reading and Assigning S-Register Values.  
S0  
Number of Rings Until Modem Answers       
	Unit:   1 ring            
	Range:  0-255  
	Default:        1         
	Description:    S0 defines the number of rings the modem 
waits before answering an incoming call. The default value is one ring 
(Decimal 1), which means that the modem answers the call immediately 
after the first ring. The maximum number of rings that can be configured 
is 255. Setting the value to zero  (0) disables auto-answer completely.  
S1  
Rings Which Have Occurred                         
	Unit:   1 ring    
	Range:  0-255     
	Default:        0                 
	Description:    S1 counts the number of rings that have 
occurred. It is a "read" type of register and is seldom, if ever, used in 
typical operation. Each time an incoming ring signal is detected, S1 
increases its value by one, up to a maximum of 255. If you set S1 to a 
value other than its default value of zero, or if the value is increasing 
with rings, this new value remains stored in S1 for eight seconds after 
the last ring is counted, after which time the value reverts to zero.  
S2  
Escape Code Character  
	Unit:   ASCII Character   
	Range:  0-127                             
	Default:        43 (+ sign)       
Description:    S2 defines the escape code character. The default 
character is the plus (+) sign (Decimal 43). It may be set for any ASCII 
character. Setting an S2 value greater than 127 results in no escape  
character, and therefore no means of entering Command mode from 
On-line mode without breaking the on-line connection.  
S3  
Return Character                  
	Unit:   ASCII Character   
	Range:  0-127  
	Default:        13  
	Description:    S3 defines the character recognized as 
Carriage Return (RETURN) or "Enter". The default setting is CTRL-M 
(Decimal 13), which is the ASCII code for the RETURN key on most  
keyboards. S3 may be set for any ASCII character.  
S4  
Line Feed Character               
	Unit:   ASCII Character   
	Range:  0-127     
	Default:        10                        
	Description:    S4 defines the character recognized as Line 
Feed. The default setting is CTRL-J (Decimal 10), which is the ASCII 
code for the Line Feed key on most keyboards. S4 may be set for any  
ASCII character.  
S5  
Backspace Character  
	Unit:   ASCII Character   
	Range:  0-127     
	Default:        8  
Description:    S5 defines the character recognized as 
BACKSPACE. The default setting is CTRL-H (Decimal 8), which is the
BACKSPACE key on most keyboards. S5 may be set for any ASCII character.  
S6  
Wait Time for Dial Tone  
	Unit:   1 sec.  
	Range:  2-255, 4-255**    
	Default:        2, 4**  
	Description:    S6 sets the time the modem waits after the 
RETURN key is pressed before executing a dial command. The default setting 
is two seconds (Decimal 2) or four** seconds.  
S7  
Time for Carrier (Abort Timer)  
	Unit:   1 sec.  
	Range:  1-255, 1-45*      
	Default:        45  
	Description:    S7 defines the Abort Timer (lack of carrier) 
delay time. The default value is 45 seconds (Decimal 45). This means that, 
after dialing, the modem waits for a carrier signal for up to 45  
seconds and, if none is detected, aborts the call. The maximum S7 value 
is 255 (or 45*) seconds.  
S8  
Pause Time for Comma  
	Unit:   1 sec.  
	Range:  0-255, 4-255**    
	Default:        2, 4**  
	Description:    S8 sets the length of the pause caused by a 
comma inserted in a dialing command. The default setting is two seconds, 
(or two units Decimal 2) or four** seconds, where each unit is one second. 
S8 may be set for up to 255 seconds. S8 also sets the time the modem waits 
before retrying a call after detecting a busy signal. Some computer 
systems need more than two seconds to reset (in which case you should 
increase the value of S8).  
S9  
Carrier Detect Response Time  
	Unit:   100 mSec.  
	Range:  1-255  
	Default:        6  
	Description:    S9 sets the time delay between when the 
modem first detects a valid incoming carrier signal and when the modem 
turns on its Carrier Detect circuit. The default setting is 600 milli- 
seconds, or six units of 100 mSec each (Decimal 6). S9 may be set for 
up to 25.5 seconds.  
S10  
Carrier Loss Disconnect Delay Time  
	Unit:   100 mSec.  
	Range:  0-255  
	Default:        7  
	Description:    S10 sets the time a carrier signal must be lost 
before the modem disconnects. The default setting is 700 mSec, or seven 
units (Decimal 7) of 100 mSec. Maximum delay is 25.4 seconds (Decimal 254). 
Setting the S10 value to 255 causes the modem to not disconnect with loss of carrier. (This  
S-Register is limited to 2400 bps operation.)  
S11  
Tone Dialing: Tone Spacing and Duration  
	Unit:   1 mSec.  
	Range:  1-255, 80-255*    
	Default:        70, 80*  
	Description:    S11 sets the speed of tone dialing (spacing 
and tone duration times). The default value is 70 units (Decimal 7) or 80* 
units, where each unit is one mSec, meaning that each tone is on for 70  
mSec with a 70 mSec pause between each.  The minimum S11 value allowed by 
most telephone systems is 50 mSec (50 units). Very few telephone systems can 
handle anything faster than that. The maximum S11 value is 255 mSec (255  
units).                           
S13  
Remote Configuration Escape Character  
	Unit:   ASCII Character  
	Range:  0-127  
	Default:        37 (% sign)  
	Description:    S13 defines the remote configuration escape 
character (which becomes your modem's remote configuration character). The 
default is three percent symbols (%%%). When the S13 character is entered 
three consecutive times from a remotely connected site, your modem responds 
with its Remote Configuration procedure.  
S15  
Callback Time Delay  
	Unit:   Sec  
	Range:  10-255  
	Default:        20   
	Description:    S15 defines the time delay between Callback 
attempts after initial passwords have exchanged between modems.    
S16  
Callback Attempts  
	Unit:   1 Attempt  
	Range:  1-255  
	Default:        4   
	Description:    S16 defines Callback attempts after initial 
passwords have exchanged between modems.  
S17  
Changing Break Time  
	Unit:   10 mSec.  
	Range:  0-2.5 sec  
	Default:        250   
	Description:    S17 defines the length of break time (space) 
sent to local PC.  Depending on the host computer, you may need to send a
"break" signal to commence or interrupt a session. The default is set  
for a 25 to 250 mSec break. The break time is changed in 10 mSec 
increments by increasing or decreasing the value of S17.  
S24  
PBX/CBX Disconnect Drop Time for DSR/CTS/CD  
	Unit:   50 mSec.  
	Range:  0-255  
	Default:        20   
	Description:    Some PBX and CBX phone systems require the modem's 
DSR, CTS, and/or CD signals to behave in a certain manner when calls are 
disconnected. The MT1432BA's &R, &S, and &C commands cause the modem to drop 
these signals for a specified time period upon disconnect, and then  
bring the signal(s) up again. S24 defines the length of time that the 
signal(s) drop. The default setting of 20 results in a one second drop time, 
which is what most PBX/CBX systems with this requirement need.  
S25  
DTR Dropout Time   
	Unit:   100 mSec.  
	Range:  0, 1 through 255  
	Default:        0   
	Description:    S25 defines the amount of time that DTR 
must be dropped before the modem disconnects. Normally, a disconnect occurs 
when DTR is dropped for 50 milliseconds or more. This dropout time can be 
increased, up to a maximum of 25.5 seconds. The S25 unit value for zero is 
the default value of 50 mSec. For values from 1 through 255, the unit value 
is 100 mSec.  
S26  
Failed Password Attempts  
	Unit:   1 failed attempt  
	Range:  0-255   
	Default:        0   
	Description:    S26 counts the number of times a failed password 
attempt occurs. For example, if you entered ATS26? the message 003 would 
be displayed, meaning someone has failed three times to gain access to 
your modem using its password security system.  
S29  
Local Inactivity Timer  
	Unit:   minutes  
	Range:  1-255   
	Default:        20  
	Description:    S29 defines the amount of idle time that can 
elapse between AT commands after the SETUP password has been entered.  
If this timer expires, the LOGIN and SETUP passwords will have to be 
re-entered.  S29 only takes effect when the modem has been sent 
a #DB1  command, which secures the modem from local and remote 
configuration or dialing (i.e., no AT commands can be sent until the  
LOGIN and SETUP passwords have been entered).     
S30  
Inactivity Timer  
	Unit:   1 min.  
	Range:  0-255   
	Default:        0   
	Description:    S30 causes the modem to disconnect if no 
data is transmitted or received for a specified time. This timer runs 
during both Reliable and Normal connections. The timer restarts any time a  
data character is passed through the serial port (either sent or received). 
If noise on the phone line causes an error to be received during Normal mode, 
this also restarts the timer. The default value is off (0). The inactivity 
timer is disabled by setting S30 to 0, which is the factory default setting.  
S32  
Time Elapse for Escape Sequence  
	Unit:   1 second  
	Range:  0-255   
	Default:        20   
	Description:    S32 sets the time period to validate the escape 
sequence. If the time interval expires before the escape sequence is 
employed (by hitting RETURN), the escape sequence is aborted. The  default 
is 20 units (one second).  
S34  
Buffer Length of Command Mode...After On-line Escape Sequence  
	Unit:   ASCII Character  
	Range:  0-60  
	Default:        10   
	Description:    If the number of characters after AT exceeds 
the S34 buffer length value, the buffer is cleared and the escape sequence 
is aborted.  
S36  
Time Between DTR Inactive and Modem Off-Hook  
	Unit:   1 Second  
	Range:  0-255 seconds  
	Default:        0  
	Description:    The DTR Busy-out feature uses S-Register 
S36 to set the time between DTR inactive (low) and the modem going off-hook.  S36 can be set in one-
second intervals from 0 to 255 seconds.  With the default setting of S36=0, 
DTR Busy-Out is disabled (i.e., DTR won't Busy-Out).  
  
S37  
Time Between DTR Active and Modem On-Hook  
	Unit:   1 Second  
	Range:  0-255 seconds  
	Default:        5  
	Description:    S37 sets the time between DTR being active and the 
modem going on-hook (not busy).  S37 will only function in conjunction with 
S36.  
5.2     Reading and Assigning S-Register Values  
The S command is used to assign a value to, and to read the current 
value of, an S-Register. To read an S- Register value, enter the letter 
S followed by the S-register number and a question mark (?), then hit  
RETURN. For example, entering ATS7? and hitting RETURN displays 
the value of S-Register S7 in a 3- digit decimal form. The number 8 
would appear as 008, the number 30 would appear as 030, and the  
number 255 would appear as 255.  To assign a value to an S-Register, enter 
the letter S followed by the S-Register number and an equals sign  
(=), and then a decimal response to the message "ENTER THE NEW 
VALUE IN DECIMAL FORMAT".  Convert all ASCII characters to their decimal 
equivalents before entering them. S-Register decimal values  
range from 0-127 for ASCII characters, or 0-255 for numeric values. A 
complete ASCII conversion chart is located in Appendix A of this manual.  
5.2.1   Examples of Assigning Values      
1.      Let's say you wish to have longer pauses caused by the comma 
in a dial command; five seconds  instead of two. Entering ATS8=5 assigns 
5 as the value for S-Register S8 (meaning the modem pauses five  
seconds for a comma in a dial command).  
2.      In a second example, let's say that you wish to configure the 
MT1432BA modem to answer incoming calls after the 30th ring instead of 
after the first ring. To configure S-Register S0 with a value of  
30, enter ATS0=30 and hit RETURN.  
3.      In a third example, let's say you are calling long distance to 
another country code, and it is taking a long time to connect. The 
S-Register S7 (Abort Timer) setting of 35 seconds you have stored in 
non-volatile memory, is insufficient. The abort timer times out and 
cancels the call before a connection is made. To change the S7 value to 
45 seconds, enter Command mode, then enter ATS7=45 and hit RETURN. Now,  
after dialing, the modem allows 10 more seconds for a carrier signal 
before aborting the call. The additional 10 seconds should provide 
enough time for international calls.  
  
5.2.2   Examples of Reading Values  
To verify that you entered the value correctly in the above examples, 
enter ATS8? and hit RETURN in the first example, ATS0? in the second, 
and ATS2? in the third example. You should receive the response 005  
in the first example, 030 in the second example, and 045 in the third 
example.  
When configuring the S-Registers, it is a good practice to include the 
verification read-entry in the same command line as the configuration 
assignment-entry. In the three preceding examples, enter ATS8=5S8?,  
ATS0=30S3?, and ATS7=45S7?. 

5.3     AT Command and S-Register Summary  
Your MT1432BA has a default configuration of originating a call to 
another 14400 bps modem that supports error correction, data compression 
and flow control ("Maximum Throughput").  If the receiving  
modem is not compatible, the MT1432BA can match protocols, 
provided the protocols are industry standard (i.e., CCITT or  Bell ) 
and not proprietary.  You may, however, have an application where 
you do not want or require this kind of maximum throughput  
(e.g., service does not support error correction, or the V.42 handshake 
interferes with logon sequence). You may want to configure the MT1432BA 
to be strictly an auto-answering device or perhaps function in a Unix  
environment.  
The &W command, used in conjunction with specific other AT 
Commands and S-Registers, can reconfigure the MT1432BA to conform to a 
specific application.  An example of the &W command:  
AT&E2$SP1#L3$R0$MB14400$SB57600$EB1S0=10&W0<CR>  
  
The MT1432BA can store its configuration parameters and S-Register 
values in its non-volatile memory. The command AT&W0 (or AT&W) causes 
the modem to store its current parameters and values in its non- 
volatile RAM.  This command also sets the modem so that on  power 
up, or when it is reset with an ATZ command, the modem reads all its 
configuration and S-Register parameters from RAM, and not from the  
factory settings in ROM.  The &W command changes the configuration 
parameters stored in RAM that you specifically intend to alter.  
All other default parameters remain unchanged.   
The AT&W1 command sets the modem so that it does not store its 
parameters to RAM, and on power up or when an ATZ command is entered, 
parameters will be read from the factory default settings in ROM.  
Before using the &W command, you may want to view the modem's 
current operating parameters.  Use the ATL5, ATL6 and ATL7 commands 
to display the current modem configuration.  
  
5.3.1    Summary  
V.42 error correction is built into the MT1432BA to detect and correct 
virtually 100% of transmission errors, (usually caused by noisy phone 
lines).  When errors are detected, the V.42 protocol  causes the  
modem to retransmit the data block in which the error was found.  
V.42bis and MNP 5 data compression features are built into the 
MT1432BA to provide a higher data throughput than the modem's modulation 
speed.  The throughput increase depends on the type of data being  
transmitted.  
The MT1432BA also supports CCITT V.17 Group 3/EIA TR-29 Class 
2 fax operation. This enables the modem to send and receive text, 
graphics and images to and from any Group 3 fax machine.  
The MT1432BA can be set for one of three different modes of 
operation, along with activating data compression in the reliable mode.  
The Normal Mode (&E0) disables error correction, the Reliable Mode  
(&E2) turns it ON, and the Auto-Reliable Mode (&E1) allows the 
modem to automatically turn V.42 ON when it detects its use in another modem.  
Flow control methods are used by the MT1432BA  to prevent data loss 
from buffer overflow.  The modem can both initiate flow control and 
respond to pacing, using either Xon/Xoff commands or RS232C signaling  
via CTS (from the modem) or RTS (from the computer/terminal).  
Hewlett- Packard ENQ/ACK is also supported.  If needed, Xon/Xoff commands  
can be passed through the modem to a remote computer or terminal.  
The MT1432BA's speed conversion feature allows the modem to 
operate at one speed over the telephone lines and another speed over the 
RS232C serial port.  This allows the computer or terminal to communicate  
with the modem at a fixed speed of up to 57,600 bps, while the modem 
operates at various rates of up to 14400 bps (V.32bis enabled).  This
ability is vital if data compression is to be effective, since your  
computer or terminal must send data to the modem at a higher speed 
than the rate at which the modem is sending data over the phone line. 
 
 
6.1     Introduction  
This chapter describes how the MT1432BA Callback and Remote 
Configuration features operate. These features use a multi-level security 
system, which involves the use of LOGIN Passwords, Set-up Passwords  
and Remote Escape Characters.  
The primary level security code is the modem's LOGIN Password. 
Once this password is entered, other passwords can be used. For instance, 
entering the LOGIN Password will allow you to enter the Set-up  
Password, which, in turn, allows you to enter Callback Passwords and 
dial back phone numbers. Callback Passwords tell your modem what dial back 
phone number to call.  The Remote Escape Character is the key to using the 
Remote Configuration feature. The Remote Escape Character lets you enter 
Command mode via a remote call, so that you can enter AT commands just as if  
you were locally connected. You must also enter your modem's Set-up 
Password .  The Remote Escape  Character is contained in S-Register S13.  
6.2    Callback Feature Description  
The Callback feature protects your network from unauthorized access 
and helps control long distance costs.  By use of Callback Passwords and 
dial back phone numbers, you can have your modem "dial back" remote  
locations immediately after being called.  A special command (Enable 
Callback #DB) turns your modem into a Callback security modem.  The 
Callback Password/Phone number entry  is protected by two-level  
security (your modem's LOGIN Password and Set-Up Password) that 
keeps unauthorized personnel from changing parameters.  When you first 
get your modem, you need to change both security level codes to your  
unique settings.  
The Callback Passwords and dialback phone numbers are in a special 
Callback Password/dial back phone number memory (30 numbers long).  You 
use the modem's LOGIN Password and the Set-Up Password plus  
special Callback commands to access this memory.  The memory is 
thirty numbers long and replaces  your  modem's  normal phone number 
memory.  Each number is 35 characters long and can contain commands as  
well as phone numbers.  You need to set up your modem with the numbers and 
codes as part of the dialback initilization procedures.   
Your modem will also remember if the incoming call was reliable or 
not, and make the call back  accordingly.  
  
6.3    Remote Configuration Description  
The Remote Configuration feature is a network management tool that 
allows you to configure modems remotely. This means you could configure 
modems anywhere in your network from one location without  
having to visit the sites or rely on remote users to follow your 
instructions. With Remote Configuration, which is protected by two level 
security, you can downline load new parameters, program new V.42  
capabilities and implement new features. Remote Configuration also 
makes troubleshooting a remote location a lot easier.  
The way Remote Configuration works is that S-Register S13 has been 
set-up to contain the special Remote Configuration escape code.  When 
calling a Remote Configuration equipped modem, you enter the proper  
Remote Escape code to enable entering your Set-up Password. After 
entering it, you can then execute AT commands as if you were connected 
locally. If you set S-Register S13 to zero, Remote Configuration is  
disabled.  

6.3.1 Initial Set-up Procedures for Callback/Remote Configuration.  
							
  Your modem was shipped with a default LOGIN Password and Set-up Password 
(LOGIN=MULTI-TECH and Set-up=MODEMSETUP) so that you have access to the 
features used for configuring the modem. Because the defaults are in the 
modem  owner's manual, and anyone can find out what they are, you should 
change the codes as the first step of your initialization procedure.  
TABLE 6-1.  Modem LOGIN, Set-up and  Remote Escape Code Procedures  
	Step               Procedure  
	
To change your modem's LOGIN Password and Set-up Password:  
		Note: Passwords are upper/lower case sensitive.         
		      The case you enter here is the case that 
		      must be used at Log-In.  
	
	1.      Type AT#IMULTI-TECH and hit Return. Your        
		modem will respond with:  
		      OK (if the LOGIN Password is wrong, the         
		      modem's response is ERROR)  
	
	2.      Type AT#SMODEMSETUP and hit Return. Your        
		modem will respond with the following:  
			OK (or ERROR if wrong Set-up Password)  
		Note: At this point you can change the LOGIN Pass       
		word and Set-up Password.  
	  
	Step                    Procedure  
	3.      Type AT#I=xxxxxxxxxx (with any keyboard charac  
		ters used, minimum 6 maximum 10) and hit Re-                 turn. Your modem 
		responds with:  
			       OK  
	4.      Type AT#S=yyyyyyyyyy (with keyboard characters  
		used, minimum 6 maximum 10) and hit Return.
		Your modem responds with:  
			OK  
To change your Remote Configuration feature status:  
	5.      If you want Remote Configuration off, set S-Register    
		S13 to 0 (zero). Refer to  Chapter 5 for details on 
		how to set S-Register values.
	6.      If you want Remote Configuration on and wish to         
		change the Remote Escape  Character, change the
		S-Register S13 value. If you leave it at the default
		value, decimal 37 (% sign) will be your modem's remote 
		escape character.  

To turn your modem's Callback Security feature on and off:  
	7.      If you want Callback Security with both remote and      
		local password security, enter AT#DB1 and hit RETURN.  
		You must turn on Callback Security to be able to enter 
		dialback phone numbers.  
	8.      If you want Callback Security on with just remote       
		password security, enter AT#DB2 and hit RETURN.
		You must turn on Callback Security to be able to          
		enter dial back phone numbers.  If you want to use      
		your modem to call another modem that is also set          
		for Callback, you must enter AT#DB3 before you          
		dial. (Note: this is for your modem if you are set for  
		#DB1 or #DB2.)  Once you have disconnected from               
		that call, your modem will go back to its original                  
		setting.  
	9.      If you want Callback Security turned off, type  
		AT#DB0 and hit RETURN.   
To set parity of the password/message prompt:  
	10.     The parity default value for your modem is no parity    
		(AT#P0). If your modem's prompt messages use             
		even parity, enter AT#P2 and hit RETURN.  For odd         
		parity,enter AT#P1 and hit RETURN.  
	11.     Enter the &W0 command and hit RETURN to store   
		parameters and S-Register values in RAM.  
		TABLE 6-2.  Callback Password and Dial Back 
Phone Number Entry Procedures  
Step                         Procedure  
	1.      Enter your modem's LOGIN Password (as selected  
		in Table 6-1) by entering  the following:  
			AT#Ixxxxxxxxxx<CR> (xxxxxxxxxx from     
		Table 6-1)  
		Enter your modem's set-up Password (as selected         
		in Table 6-1) by entering  the following. 
			AT#Syyyyyyyyyy<CR>(yyyyyyyyyy from      
		Table 6-1)  
	2.      Enable the Callback Security feature by entering the    
		following:  
			AT#DB2<CR>  or  AT#DB1<CR>  
		The following message is displayed on your monitor:  
		Entering Callback Mode, current phone numbers  will 
		be erased.  Do you want to continue? Y/N 
	3.      Enter a Y or N and hit RETURN.  
		Note: If this is your first time into Callback Mode, we 
		recommend answering Y to clear all previous Call
		back Passwords and phone numbers from memory.  
		TABLE 6-2.  Callback Password and Dial Back 
Phone Number Entry Procedures  
(Cont'd)  
     Step                           Procedure         
	4.      Enter individual Callback Passwords for each of 30      
		different phone number memory locations as                     
		follows:  
			AT#CBN0xxxxxxxxxx<CR> To enter Call     
		back Password  for the first location (a                               
		minimum 6 characters, up to a maximum of           
		10 characters must be used).  
			AT#CBN1xxxxxxxxxx<CR> To enter Call     
		back Password  for the second location...etc                   
		(a minimum 6 characters, up to a maximum              
		of 10 characters must be used).  
		Note: The first character of your first Callback        
		Password must be non-numeric.  
	5.      Enter individual phone numbers for each of the 30       
		memory locations as  follows:  
			AT+ - DP...????N0 <CR> (number for      
			location  N0)  
			AT+ - DT...????N1 <CR> (number for      
			location   N1)...etc  
	Note:You must indicate within the command string that the modem 
	either Pulse dial (ATDP...) or Tone dial  ATDT...).  
	
	The maximum length of the number is 35 characters. The number may 
	include commands as well as your number, so as to create macro-type  
	command numbers. The + and/or - characters entered before the phone 
	number are optional. The + (Deposit Number) code  
	allows a caller to enter the number he or she wishes the Callback 
	modem to call back when the caller uses a  
	particular password (Step 3 of Table 6-3). The - character enables 
	direct entry when the caller uses that  correct   
	password (Step 3  of Table 6-3) without the Callback modem having to 
	return the call.    
	The ??? entry at the end of the phone number is optional and indicates a 
	subcode number to the main phone  number for that location.  The ??? 
	used to dial different extensions at the same basic number.  To use 
	this optional feature, enter the number of ? marks where indicated 
	equal to the number of digits in the desired  extension number 
	(i.e., with a 4 digit extension enter ????).  When a caller uses that particular password  
	(Step 3 of Table 6-3), he or she then enters an extension number 
	directly after the password, with the same number of digits as the 
	number of ? marks originally entered.  When calling back that 
	particular number, your modem will also dial the indicated extension 
	number.  Note: To view Callback Passwords/Numbers, use the L Command.  
	Entry Procedures (Cont'd)  
      
      Step                   Procedure  
	6.      To store changed parameters to memory, enter    
		AT&W0 and hit RETURN.   
		Note: If you have enabled Callback Security (#DB1       
		in step 2 of Table 6-2), the MT1432BA will be secured 
		locally.  To gain local access,  you must again    
		perform steps 7 and 8.  
	7.      Enter your modem's LOGIN Password (as selected  
		in Table 6-1) by entering:   
			AT#Ixxxxxxxxxx<CR> (xxxxxxxxxx from     
		Table 6-1)  
	8.      Enter your modem's Set-up Password (as selected         
		in Table 6-1) by entering:   
			AT#Syyyyyyyyyy<CR> (yyyyyyyyyy from     
		Table 6-1)  
  
		TABLE 6-3.  Callback Operational Sequence Procedures  
	Step                         Procedure  
 Perform the following steps when dialing into a dialback modem.  
	1.      When called, the modem answers and after a slight       
		delay, responds with:  
			Password>  
	2.      Enter your modem's LOGIN Password (Table 1) and         
		hit RETURN.  If entered  correctly, the modem      
		responds with:  
			DB>  
	3.      Enter the Callback Password corresponding to the        
		phone number you wish called back and hit RE-           
		TURN (Callback Passwords and phone numbers      
		entered in Table 6-2).  You can also use special                
		characters + and -.  They must have been entered          
		as part of the Callback phone numbers in Step 5 of            
		Table 6- 2.  If you use the - character along with 
		your password, the Callback modem will connect directly     
		without hanging-up and calling back.  If you use the    
		+ character along with your password, you can also        
		enter a phone number which you wish the Callback               
		modem to dial after hanging-up. The + and - charac-           
		ters must be entered after the Dial-back password,    
		(i.e., DB>xxxxxx+).  This is also the point where               
		you enter an extension  number if your Callback 
		number used the ??? feature (Step 5 in Table 6-2).  
		You have three tries at each prompt to enter the                
		information properly, with an incorrect entry 
		resulting in a password retry.  You must enter 
		the requested information correctly within one minute 
		or the Callback  modem will hang-up.   When the 
		information is entered properly, the called modem 
		will hang-up and after a 15 second delay, call you back.  
		When your modem answers, the dialback  modem will respond 
		with the following:  
			Password>  
	4.      Enter the modem's LOGIN Password again (the     
		same as in Step  1).  The Callback modem responds with:   
			CONNECT  
		You are now in Data Mode.                                        
    
    6.3.2    Remote Configuration Procedures  
The procedures for using the Remote Configuration features are the 
same whether or not a call originates  
from the remote modem. Once the modem is on-line, perform the 
procedures in Table 6-4.  
		TABLE 6-4  
Remote Configuration Operation Procedures  
	  Step                 Procedure  
	1.      Remote Escape Configuration requires a BREAK,   
		then three % signs to be sent if the default value in            S-Register S13 has not been 
		changed.  
		The modem responds with:  
			1. - DATA Mode  
			2. - COMMAND Mode  
	  
	  Step                 Procedure  
	2.      You then select 1 or 2 .  With 1, the modem goes        
		back into data mode and with 2, the modem re                    
		sponds with the following:  
			Password>  
	3.      Enter your Set-up Password, and if the code is  
		correct the  modem responds with:  
			OK  
		You can now use any AT commands of the modem    
		being remotely configured  as if they were being                   
		entered locally. You cannot change the Set-up of the          
		LOGIN Password until you enter the proper LOGIN         
		Password.   
	4.      When you are done entering AT commands and you  
		want to exit, type AT0 and  hit return. The modem           
		responds with:  
			1. DATA Mode  
			2. COMMAND Mode  
	5.      Enter a 1 to go back on-line with your computer, or     
		enter 2 and the correct password to talk to your                        
		modem.  
6.4   Remote Configuration and Callback Security AT Commands    
The following AT commands are used with Remote Configuration and 
Callback Security features.  
  
Assign Passwords        When you have callback security enabled for   
for Callback Phone      the MT1432BA, anyone trying to connect with   
Numbers                 the modem will be required to furnish a password.  
			The #CBN  command allows you     
     #CBN               to enter passwords for each of the 30 memory 
			locations used for callback security.  The  
			length of each password can be up to 10 
			characters, but must be at least 6 characters.  
			Any ASCII character can be used.  
		  
			The format for this command is AT#CBNyyxxxxxxxx
			<CR> with xxxxxxxx  representing the password 
			and yy being the memory location (0-29).  Each 
			callback password (xxxxxxxx) must start with  
			a non-numeric character.  
  
Callback Security       The purpose of this command is to enable   
Enable/Disable          or disable (default setting) your modem's callback 
			security option.  Once this command is executed,
     #DB                you modem will undergo some significant changes.  
			For example, the phone number memory locations 
			(N0 through N9) will be used for passwords and 
			phone numbers.   In other words, you will not be 
			able to dial from memory or use the DTR dialing 
			feature.  
		  
			You can turn on callback security by typing AT#DB1 
			or AT#DB2 and pressing <CR>.  If you want to engage 
			both remote and local password security, use the 
			#DB1 command.  This sets up the modem so you have to 
			provide passwords to dial into the modem and to 
			dial out.  For remote password security only, use 
			the #DB2 command.  This allows the local operator 
			to dial out without providing the LOGIN and SETUP 
			passwords.  Use #DB3 when calling another modem 
			with callback security active.  
  
  
Change LOGIN           The default LOGIN password for your       
Password               MT1432BA is "MULTI-TECH".  If you choose to 
		       activate callback security, you should   
     #I                change the LOGIN password using this command in the 
		       following format:  
		       AT#Ixxxxxxxxxx<CR> (where xxxxxxxxxxxxxxxx is 
		       the current LOGIN password). Your modem will respond 
		       with "OK", indicating that you can enter the 
		       new LOGIN password as follows:  
		       AT#I=yyyyyyyyyy<CR> You can select any combination 
		       of keyboard characters (upper/lower case sensitivie)  
		       between six and ten characters long.  
  
Change SETUP           The default SETUP password for your       
Password               MT1432BA is "MODEMSETUP".  If you choose to 
		       activate callback security, you    
     #S                should change the SETUP password using this command 
		       in the following format:  
		       AT#Stttttttttt<CR> (where tttttttttt is the current 
		       SETUP password).  Your modem will respond with "OK", 
		       indicating that you can enter the new SETUP 
		       password as follows:  AT#s=uuuuuuuuuu<CR>  
		       You can select any combination of keyboard 
		       characters (upper/lower case sensitivie)  
		       between six and ten characters long.  
  
Erase Callback         This command erases the single callback   
Password               password specified by xx (0 through 29).  
#RCBNxx   
  
  
Erase Callback         This command erases the single phone    
Phone Number           number specified by xx (0 through 29).  
#RDNxx            
  
  
6.5   Remote Configuration and Callback Security                        
		S-Registers  
The following S-Registers are used with Remote Configuration and 
Callback Security features.  
  
S13  
Remote Configuration Escape Character  
	Unit:   ASCII Character  
	Range:  0-127  
	Default:        37 (% sign)  
	Description:    S13 defines the remote configuration escape 
	character (which becomes your  
	modem's remote configuration character). The default is three percent 
	symbols (%%%). When the S13 character is entered three consecutive 
	times from a remotely connected site, your modem responds with its  
	Remote Configuration procedure.  
S15  
Callback Time Delay  
	Unit:   Sec  
	Range:  10-255  
	Default:        20   
	Description:    S15 defines the time delay between Callback 
	attempts after initial passwords have exchanged between modems.    
  
S16  
Callback Attempts  
	Unit:   1 Attempt  
	Range:  1-255  
	Default:        4   
	Description:    S16 defines Callback attempts after initial 
	passwords have exchanged between  modems.  
  
S26  
Failed Password Attempts  
	Unit:   1 failed attempt  
	Range:  0-255   
	Default:        0   
	Description:    S26 counts the number of times there has 
	been a failed password attempt. For example, if you entered ATS26? 
	the message 003 would be displayed, meaning someone has failed three  
	times to gain access to your modem using its password security system.  
  
S29  
Local Inactivity Timer  
	Unit:   minutes  
	Range:  1-255   
	Default:        20  
	Description:    S29 defines the amount of idle time that can 
	elapse between AT commands after the SETUP password has been 
	entered.  If this timer expires, the LOGIN and SETUP passwords 
	will have  to be re-entered. S29 only takes effect when the modem 
	has been sent a #DB1  command, which secures  the modem from local 
	and remote configuration or dialing (i.e., no AT commands can be 
	sent until the  LOGIN and SETUP passwords have been entered).     
  
						 
  
7.1    Introduction   
Each time you power up the MT1432BA, it performs an automatic self- 
test to ensure proper operation. The  MT1432BA also has three diagnostic 
test features: Local Analog Loopback, Digital Loopback  
(remote/automatic) and Digital Loopback (local/manual).   
A loopback test involves entering data from your PC and looping that 
data through the circuits of your modem and/or a remote modem.  When
the loop has been completed, the original data entered should match  
the data received back on your PCs monitor after the test.  
The Local Analog Loopback Test allows you to verify that the modem's 
transmitter and receiver circuits are  functioning properly.  
The Digital Loopback Test (local/manual) allows you to verify that the 
remote computer or terminal, the  remote modem, serial ports, the 
telephone line and the local modem are functioning properly.   
The Digital Loopback Test (remote/automatic) allows you to verify that 
the local computer or terminal, the  two modems and the transmission 
line between them are functioning properly.  
In asynchronous mode, upon completion of testing, enter either Escape 
Sequence, +++AT<CR> or  <BREAK>AT<CR>.  
Note: All loopback tests will operate at all speeds except 300 bps.  
  
7.2    Local Analog Loopback Test/V.54 Loop 3   
In this test, data from your computer or terminal is sent to your  
modem's transmitter, converted into analog  form, looped back to the
receiver, converted into digital form and then received back at your monitor 
for  verification.  No connection to the phone line is required. See  
Figure 7-1.   
		Figure 7-1.  Local Analog Loopback Test  
  
The test procedure is as follows:   
1.      Connect the modem to your computer. With your 
	communication software, set the desired baud  
	rate.    
2.      Type ATU0 (or ATU) and hit ENTER. This places your 
	modem in Analog Loopback mode, in the  Originate mode. 
	The modem is now out of the Command mode and in a 
	pseudo On-Line mode.   
3.      Once you receive a connect message (if responses are 
	enabled), enter data from your keyboard. For this test, 
	typing multiple upper case "U" characters is a good way to 
	send an alternating test pattern of ones  and zeros.   
4.      For a more complete test, you should also test the modem in 
	Answer mode. To do this, you must "escape" from Originate mode 
	by entering an Escape Sequence (+++AT<CR> or <BREAK>AT<CR>) .  
	Then type ATU1 and hit ENTER to place the modem in Analog 
	Loopback mode, in the Answer mode.  Then repeat step 3.   
5.      When testing is completed, you may exit Answer mode by 
	entering an Escape Sequence (+++AT<CR> or <BREAK>AT<CR>), 
	which returns the modem to Command mode.   
6.      Your modem passes this test if the data entered from your 
	keyboard is the same as the data  received on your monitor.  
	If different data is appearing on your monitor, your modem is 
	probably causing  the problem, although it could also be your 
	computer. If your modem passes this test, but you are receiving  
	errors while On-line, the remote modem or the phone line could be at 
	fault.   
  
7.3    Digital Loopback Test/V.54 Loop 2 (Local/                        
Manual)  
In this test, your modem must be On-Line with another modem that can 
respond to a request for Digital  Loopback, such as another MT1432BA. 
The Digital Loopback Test is an on-line test that loops data sent  
from one modem across the phone line to another modem, then back to 
the first modem.  See Figure 7-2.  
There are two ways to put a modem into Digital Loopback mode.  
	1.  Locally or Manually, described here in section 7.3.  
	2.  Remotely or Automatically, see section 7.4.  
Note: The Digital Loopback Tests can only be used with the modem in 
Normal mode (error correction off).   
  
In this test the local modem is placed in Digital Loopback mode.  Data 
is entered and transmitted from the  remote modem (which is not in digital 
loopback mode), sent across the phone line to the local modem and  
looped back to the remote modem.   The test procedure is as follows:   
1.      Go into Terminal mode. Type AT and hit ENTER; you should 
	get an OK message.   
2.      Dial the remote modem by entering the Dial command and the 
	phone number, to establish On-line mode.   
3.      Type the Escape Sequence (+++AT<CR> or <BREAK>AT<CR>) which 
	brings your modem into Command mode, while still maintaining the 
	pseudo On-line mode with the remote modem.   
4.      Type ATU3 from the local PC and hit ENTER. Once you receive an 
	OK message from your modem (if responses are enabled), the local 
	modem is placed in Digital Loopback mode.  
5.      Data is typed from the remote keyboard. For this test, typing 
	multiple upper case "U" characters is  a good way to send an 
	alternating test pattern of ones and zeros. The data received by 
	the local modem will enter its analog receiver, be converted to 
	digital data, be reconverted into analog, and then looped through  
	its transmitter back to the remote modem. Your modem passes this test 
	if the data entered from the remote keyboard is the same as the data 
	received on the remote monitor.   
6.      When testing is complete, you may end the test by typing an 
	Escape Sequence (+++AT<CR> or <BREAK>AT<CR>) to bring your modem 
	into Command mode. The modem should respond with an OK  
	message. If you wish to stay On-line with the remote modem for normal 
	data transmission, type AT0 and hit ENTER. If you wish to terminate 
	the call, type ATH and hit ENTER to hang up.   
  
7.4    Digital Loopback Test/V.54 Loop 2(Remote/Automatic)  
In this test, your modem must be On-line with another modem set up to 
respond to a request for Digital  Loopback, such as another MT1432BA. With 
the MT1432BA, this ability to respond is controlled by the &T command. AT&T4 
enables the response to Digital Loopback Test (remote/automatic). AT&T5 
disables the response. The modem defaults to disable on power up, so this 
must be changed on the remote modem  before the modem will respond to a 
request for the Digital Loopback Test (remote/automatic).   
Initiate the Digital Loopback Test (remote/automatic) with the ATU2 
command which automatically places  the remote modem in digital loopback 
mode. Data from your computer or terminal are transmitted through  
your modem, and over the phone line to the remote modem, where they 
are then looped back to your  modem.  See Figure 7-3.  
      The test procedure is as follows:  
1.      Go into Terminal mode. Type AT and hit ENTER; you should 
	get an OK message.   
2.      Dial the remote modem by entering the Dial command and the 
	phone number, to establish On-line  mode.   

Note: The &T4 command must be set on the remote modem to run this 
      test.  
3.      Type the Escape Sequence (+++AT<CR> or <BREAK>AT<CR>) which 
	brings your modem into Command mode, while still maintaining 
	the connection with the remote modem.   
4.      Type ATU2 and hit ENTER. The local modem responds to this command 
	by transmitting an unscrambled marking signal, which causes the 
	remote modem to place itself in Digital Loopback mode. Then the 
	local modem exits Command mode and enters pseudo On-line mode.  
5.      Type data from your keyboard. For this test, typing multiple upper 
	case "U" characters is a good way to send an alternating test 
	pattern of ones and zeros. The data received by the remote modem 
	will enter its analog receiver, be converted to digital data, be 
	reconverted into analog, and then looped through its transmitter 
	back to the local modem. Your modem passes this test if the data 
	entered from the local keyboard is the same as the data received 
	on your monitor.     
  
7.5     Synchronous Mode Testing  
The following tests must be run with your modem in Synchronous mode 
(DIP Switch #12 in the Up  (OPEN) position), DIP Switch #9 controls 
the modem's Synchronous mode testing function. (Refer to  
Chapter 8 for DIP Switch information.) The test procedures for 
Synchronous mode are different from those  for Asynchronous mode. In 
Synchronous mode, you cannot access the modem's AT commands.    
With DIP Switch #9, you can perform either the Digital Loopback Test 
(remote/automatic) or the Digital  Loopback Test (local/manual) in 
Synchronous mode, as described in the following sections. There is also a  
Local Analog Loopback Test, documented in section 7.6.   
    
7.6    Local Analog Loopback Test (Synchronous Mode)  
This test diagnoses the connection between your MT1432BA and your 
computer or terminal. In Local  Analog Loopback Test mode, data entered 
at the local computer or terminal are sent through the local  
modem's transmit and receive circuits (much like entering an ATU or 
ATU1 command in Asynchronous  mode). You then compare the test 
characters (multiple upper case "U" characters in Figure 7-4) on your  
monitor with the characters you typed. If the characters don't match, 
check your computer's COM port setting, then verify your communication 
software's configuration.   To initiate the Local Analog Loopback Test, 
with the modem in Synchronous mode:  
1.      Enter AT&M1U. This first switches your modem form 
	asynchronous to synchronous mode, and places it into the 
	Analog Loopback/Originate mode.  The modem is 
	now out of the Command mode and in  the pseudo On-Line mode.  
2.      Once you receive a connect message (if responses are enabled), enter 
	data from your keyboard.  For this  test, typing multiple upper 
	case "U" characters is a good way to send an alternating test 
	pattern of ones and  zeros.   
3.      For a more complete test, you should also test the modem in 
	Answer mode. To do this, Type the Escape Sequence (+++AT<CR> or 
	<BREAK>AT<CR>) which brings your modem into Command mode,  
	while still maintaining the connection.  Then type AT&M1U1 and hit 
	ENTER to place the modem in Analog Loopback mode, in the Answer 
	mode. Then repeat step 2.   
  
  
7.7    Digital Loopback Test (Local/Manual)(Synchronous Mode)  
This test must be run when you have a data connection with another 
modem. If a Local Analog Loopback  Test resulted in errors, and this test 
passes without errors, then the problem exists in your computer-to- 
modem connection. In Digital Loopback Test (local/manual) mode, 
data passed from the remote modem's transmit circuit are looped back from 
the local modem and are received at the remote modem's receive  
circuit (multiple upper case "U" characters in Figure 7-5).  
First make certain that you are set up for Synchronous operation by 
placing DIP-Switch #12 in the UP  position. To initiate the Digital 
Loopback Test (local/manual), DIP-Switch #9 must be in the UP position,  
and the Answer/Orignate switch (front of the modem) must be toggled 
to the UP position. Once you receive  an OK message from your modem 
(if responses are enabled), the local modem is placed in Digital  
Loopback mode.  To exit the Digital Loopback Test (local/manual), 
toggle the Answ/Orig switch to the Answer position.  
  
  
7.8     Digital Loopback Test (Remote/Automatic)                
	(Synchronous Mode)  
This test must be run when you have a data connection with another 
modem.  In this test, data is passed to the remote modem and is looped back 
to the local  modem (as if an ATU2 command was issued in  
Asynchronous test mode), as shown in Figure 7-6.  This lets you test the 
local and remote modem's transmit and receive circuits, as well as your 
computer's serial COM port and the phone lines. If the test results in a  
mismatch of entered/received data (multiple upper case "U" characters 
in Figure 7-6), the Local Analog  Loopback Test should be performed on 
both the remote and local modems. If that test is successful, the  
problem may be the phone lines.   
First make certain that you are set up for Synchronous operation by 
placing DIP-Switch #12 in the UP  position. To initiate the Digital 
Loopback Test (remote/automatic), DIP-Switch #9 must be in the DOWN  
position, and the Answer/Orignate switch (front of the modem) must be 
toggled to the UP position.  Once you receive an OK message from your modem 
(if responses are enabled), the local modem is placed in  Digital Loopback 
mode.  To exit the Digital Loopback Test \(remote/automatic), toggle the 
front panel  Answ/Orig switch to the Answer position. 
 
 
  
8.1     Introduction  
There are several DIP-Switch options and jumper plugs on the 
MT1432BA's printed circuit board.  The DIP-Switches are accessible 
through a cutout on the side of the modem.  It is unlikely you will need to  
access the jumper plugs, but if you do, you must remove the modem's 
printed circuit board from the  modem's chassis.  To remove the PC 
board from the modem enclosure, remove the retaining screw (on the  
bottom of the modem near the RS232 connector), and slide the PC 
board out of the modem enclosure.  
  
Figure 8-1. MT1432BA PC Board  
  
8.2    DIP-Switch Option Settings  
Switch #1  
Forced DTR -- "DTR"  
(Asynchronous/Synchronous Mode/Leased Line/Dial-Up)  
The MT1432BA  must have a high DTR signal in order to operate.  
DTR is provided to the modem by the  
terminal or computer to which it is attached, through pin 20 of the 
RS232C/V.24 interface.  If your terminal  
or computer is not providing DTR to the modem, you can force the 
DTR signal high with DIP-Switch #1.  
	DTR function normally   =       Switch #1 UP  
	DTR forced On   =       Switch #1 DOWN  
	(Factory Default Setting        = UP)  
Switch #2  
Flow Control - &E4/&E5   
(Asynchronous Mode/Leased Line/Dial-Up)  
With Hardware Flow Control, the modem uses its RS232C/V.24 
interface to control the flow of data from  
the computer or terminal to which it is attached.  CTS signal on Pin 5 of 
the RS232C/V.24 is brought low to  
stop the flow of data, and is brought high to restart it.  Place DIP-
Switch #2 in the UP position to enable  
Hardware Flow Control (&E4).  Xon/Xoff Flow Control (&E5) is 
another flow control method. Xon/Xoff  
characters in the data dictate the start and stop of data flow from the 
computer or terminal.  Place DIP- 
Switch #2 in the DOWN position to select Xon/Xoff Flow Control.  
	Hardware Flow Control (&E4)     =       Switch #2 UP  
	Xon/Xoff Flow Control (&E5)     =       Switch #2 DOWN  
	(Factory Default Setting                =       UP)  
  
Switch #2  
SDLC/BSC Option  
(Synchronous Mode/Leased Line/Dial-Up)  
Synchronous Data Link Control (SDLC) and Binary Synchronous 
Control (BSC) are two error correction  
protocols used in the IBM Mainframe environment.  Place DIP-Switch 
#2  in the UP position to enable   
SDLC mode, and place DIP-Switch #2 the DOWN position to enable 
BSC mode.  
	SDLC Mode       =       Switch #2 UP  
	BSC Mode        =       Switch #2 DOWN  
	(Factory Default Setting        =       UP)  
Switch #3  
Enable/Suppress Responses -- "Q"  
(Asynchronous Mode/Dial-Up)  
In some asynchronous mode applications, you may want to suppress all 
responses from the modem.  Place  
DIP-Switch #3 in the DOWN position to enable result code responses 
(Q0).  Place DIP-Switch #3 in the UP  
position, and answer mode is handled without responses and echo 
turned off (Q2), but originate is still  
intelligent.  
	Enable Responses: Originate/Answer (Q0) = Switch #3 DOWN  
	Suppress Responses: Answer (Q2)        =      Switch #3 UP  
	(Factory Default Setting       DOWN)  
Switch #3  
dB Transmission Levels  
(Asynchronous/Synchronous Mode/Leased Line)  
DIP-Switch #3 adjusts dB transmission levels required by some phone 
carriers.  Place DIP-Switch #3 in the  
DOWN position to enable 0 dB transmission.  Place DIP-Switch #3 in 
the UP position to enable -10 dB  
transmission.  
	0dB Transmission                =       Switch #3 DOWN  
	-10dB Transmission              =       Switch #3 UP  
	(Factory Default Setting        =       DOWN)  
Switch #4  
AS/400 Mode  
(Synchronous Mode/Leased Line/Dial-UP)  
The MT1432BA can function in the IBM AS/400 environment 
(appearing like an IBM5853 modem).  First,  
DIP-Switch #7 must be placed in the UP position. This establishes an 
RTS/CTS condition (state typical for  
an IBM5853 modem in half-duplex mode). Next, place DIP-Switch #4 
in the DOWN position.  This  
"spoofs" the  MT1432BA into operating like an IBM5853 modem in 
AS/400 applications. DIP-Switch #4  
in the UP position disables this function. Note that the MT1432BA 
must be in Command mode to allow         
	AS/400 mode (DIP-Switch #8 DOWN).    
	AS/400 Mode Enabled     =       Switch #4 DOWN  
	AS/400 Mode Disabled    =       Switch #4 UP  
	(Factory Default Setting        =       UP)   
Switch #4  
Unix UUCP Spoofing  
(Asynchronous Mode/Leased Line/Dial-Up)  
The MT1432BA can be configured for use with Unix equipment which 
employs ACK flow control to  
monitor data integrity.  The MT1432BA can do "UUCP spoofing", 
where the modem is able to generate  
ACKs at the DTE interface.  Data then is transmitted more time-
efficiently, because the delay of waiting for  
data to be received then waiting for the ACK to be returned at the 
remote end, is eliminated.  Place DIP- 
Switch #4 in the DOWN position to enable UUCP spoofing.  
	UUCP Spoofing Enabled   =       Switch #4 DOWN  
	UUCP Spoofing Disabled  =       Switch #4 UP  
	(Standard Factory Setting       =       UP)  
Switch #5  
Enable/Disable Auto-Answer - "Ans"  
(Asynchronous Mode/Synchronous Mode/Dial-Up)  
In some originate-only applications, you may wish to disable the 
MT1432BA's automatic answering  
capabilities.  This may be true if you have a telephone set attached to a 
modem and wish to receive voice  
calls that you yourself would answer instead of the modem. Place DIP-
Switch #5  in the UP position to  
enable Auto-Answer.  Place DIP-Switch #5 in the DOWN position to 
disable Auto-Answer.  
	Auto-Answer Enabled             =       Switch #5 UP  
	Auto-Answer Disabled            =       Switch #5 DOWN  
	(Factory Default Setting        =       UP)  
Switch #5  
Originate/Answer Mode  
(Asynchronous/Synchronous Mode/Leased Line)  
The MT1432BA functions in either Originate or Answer mode.  Place 
DIP-Switch #5 in the UP position to  
enable Originate mode. Place DIP-Switch #5 in the DOWN position to 
enable Answer mode.  
	Originate Mode Enabled          = Switch #5 DOWN  
	Answer Mode Enabled             = Switch #5 UP  
	(Factory Default Setting                = UP)  
Switch #6  
Maximum Throughput Setting  
(Asynchronous Mode/Leased Line/Dial-Up)  
Some users have applications where they want to dial into services with 
maximum throughput on, and other  
applications where maximum throughput must be off (i.e., service not 
supporting error correction, and the  
V.42 handshake interferes with logon sequence).  DIP-Switch #6 is 
used for switching between these two  
modes.  This DIP-Switch controls three important parameters (error 
correction, speed conversion and serial  
port speed), which in effect enables or disables maximum throughput.  
	Maximum Throughput Setting Enabled      =    Switch #6 UP  
	Maximum Throughput Setting Disabled     =    Switch #6 DOWN  
	(Factory Default Setting                =       UP)  
Switch #6   
Slave Clocking  
(Synchronous Mode/Leased Line/Dial-Up)  
In Synchronous mode, DIP-Switch #6 controls the option of having 
timing controlled by the receive clock.   
The originate modem, in effect, adjusts to the answer (remote) modem.  
Place DIP-Switch #6 in the DOWN  
position to enable Slave Clocking.  Place DIP-Switch #6 in the UP 
position to disable Slave Clocking.  
	Slave Clocking Enabled  = Switch #6 DOWN  
	Slave Clocking Disabled = Switch #6 UP  
	(Factory Default Setting        =  UP)  
Switch #7  
Request To Send Forced - "RTS"  
(Asynchronous/Synchronous Mode/Leased Line/Dial-Up)  
If your computer or terminal uses RTS/CTS protocol (typically used in 
some synchronous applications, but  
also is using hardware pacing for V.42 error correction or speed 
conversion), you may want to set RTS to  
function independently of CTS (DIP-Switch #7 UP).  For most 
applications, especially asynchronous, this  
switch should be set so that RTS is forced On (DIP-Switch #7 DOWN)  
	RTS functions Normally  =       Switch #7 UP  
	RTS forced On           =       Switch #7 DOWN  
	(Factory Default Setting        =       DOWN)  
Switch #8  
Enable/Disable Command  Mode -- "Com"  
(Asynchronous/Synchronous Mode/Leased/Dial-Up)  
In some applications you may want to disable the MT1432BA's 
Command mode so that the modem does  
not recognize or react to "AT" commands or any other commands.  
This may be true in strictly auto-answer  
applications where no call origination is required. Place DIP-Switch #8 
in the DOWN position to enable  
Command mode. Place DIP-Switch #8 in the UP position to disable 
Command mode.  The factory default  
setting is Command mode enabled.  
	Disable Command Mode    =       Switch #8 UP  
	Enable Command Mode     =       Switch #8 DOWN  
	(Factory Default Setting        =       DOWN)  
Switch #9  
Digital Loopback Test  
(Asynchronous/Synchronous Mode/Leased Line/Dial-Up)  
In Synchronous mode, this switch controls both Local Digital Loop and 
Remote Digital Loop tests while  
on-line.  When the Voice/Data switch is toggled to the Answer mode 
position (UP) and when DIP-Switch  
#9 is in the UP position, the MT1432BA performs the Local Digital 
Loopback test. When DIP-Switch #9 is  
DOWN and the Voice/Data switch is toggled to Answer mode (UP), the 
MT1432BA performs the Remote  
Digital Loopback test.  
	Local Digital Loopback Test     =       Switch #9 UP  
	Remote Digital Loopback Test    =       Switch #9 DOWN  
	(Factory Default Setting        =       DOWN)  
Switch #10   
Leased Line/Dial-Up Operation -- "DDD"  
(Asynchronous/Synchronous Mode/Leased Line/Dial-Up)  
The MT1432BA operates in either leased-line or dial-up modes.  This 
switch controls leased-line/dial-up  
operation (used in conjuction with 2-position "Flip" Switch.  See 
Section 8.6).  Place DIP-Switch #10 in the  
UP position for Dial-Up operation.  Place DIP-Switch #10 in the 
DOWN position for leased-line operation.  
	Dial-Up Operation       =       Switch #10 UP  
	Leased Line Operation   =       Switch #10 DOWN  
	(Factory Default Setting        =       UP)  
Switch #11  
"AT" Responses/Multi-Tech Responses  
(Asynchronous Mode/Leased line/Dial-Up)  
If you are in Asynchronous mode, the MT1432BA can be set to 
respond with Result Codes adhering to the  
"Multi-Tech" command responses (Switch #11 in the DOWN position), 
or to "AT" command responses  
(Switch #11 in the UP position).  The &Q command performs the same 
function (choosing "AT" or "Multi- 
Tech" Result Codes), and is explained further in section 4.3 of this 
manual.  
	"AT" Responses (&Q1)    =       Switch #11 UP  
	"Multi-Tech" Responses(&Q0)     =       Switch #11 DOWN  
	(Factory Default Setting        =       DOWN)  
Switch #11  
Internal/External Clocking  
(Synchronous Mode/Leased Line/Dial-Up)  
In Synchronous Mode, the transmit clock can be supplied by the DTE 
on pin 24 of the RS232C/V.24  
interface by placing DIP-Switch #11 UP. Place DIP-Switch #11 in the 
DOWN position to enable DCE to  
control clocking (internal clock via pins 15 and 17 of the RS232/V.24 
interface).   
	External Clock (pin 24)         =       Switch #11 UP  
	Internal Clock (pins 15/17)     =       Switch #11 DOWN  
	(Factory Default Setting        =       DOWN)  
Switch #12  
Asynchronous/Synchronous Operation -- "Sync"  
(Asynchronous/Synchronous Mode/Leased Line/Dial-Up)  
The MT1432BA can operate in both Asynchronous and Synchronous 
mode.  In Synchronous mode, start  
and stop bits are eliminated.  The modem's internal clock circuits on the 
RS232C/V.24 pins 15 and 17 are  
activated.  The MT1432BA's Command mode is not accessible in 
Synchronous mode.  In Synchronous  
operation, you may want to set the RTS forcing and CTS forcing DIP-
Switches so that both of signals act  
normally (not forced on).  
	Synchronous Operation   =       Switch #12 UP  
	Asynchronous Operation  =       Switch #12 DOWN  
	(Factory Default Setting        =       DOWN)  
Switches #13 and #14  
Speed Selection  
(Synchronous Mode/Leased Line)  
Switches #13 and #14 are used to set the modem's data transmission 
rate. Switches #13 and #14 are used in  
combination, typically in leased-line and call origination applications. 
Note that the modem baud rate  
command ($MB) overrides the setting of these speed selection switches 
(DIP switches #13 and #14).  
	14400 bps Operation     = Switch #13 UP and Switch #14 UP  
	9600 bps Operation      = Switch #13 DN and Switch #14 UP  
	4800 bps Operation      = Switch #13 UP and Switch #14 DN  
	2400 bps Operation      = Switch #13 DN and Switch #14 DN  
	(Factory Default Setting = Switch #13 UP and Switch #14 UP)  
Switch #15  
Carrier Detect/DSR Forcing -- "DSR"  
(Asynchronous/Synchronous Mode/Dial-Up/Leased Line)  
Some  terminals react in unusual ways to the toggling of the Carrier 
Detect (CD - RS232C/V.24 pin 6)  
signals.  The most common symptom is that the modem does not 
respond to commands, or does not echo  
characters.  In these cases, it is advisable to force these two signals On 
in order for the terminal to  
communicate properly with the modem in Command mode.  This is 
done by setting Switch #15 DOWN.  
Place Switch #15 in the UP position, and both CD and DSR will be 
either on or off, depending on the On- 
Line status.  
	CD and DSR normal               = Switch #15 UP  
	CD and DSR forced On            = Switch #15 DOWN  
	(Standard Factory Setting       = UP)  
Switch #16  
This switch is not used (reserved for future use).  
  
8.3     &W Lock/Unlock (EN/DIS) Jumper  
This jumper lets you lock parameters stored in modem memory. This is 
to prevent reconfiguring the  MT1432BA from its factory default 
parameter settings. Parameters can be stored on a "temporary" basis,  
and not stored to memory. The MT1432BA retains its original set of 
parameters when the modem is powered off, or when the &W1Z command 
is issued.   
		 &W0 Jumper     &W0 Jumper           
	Lock ("EN") Position    Unlock ("DIS") Position  
	(Default Setting)       (Option Setting)  
  
8.4     Test/OOS (Out Of Service) Jumper  
When the MT1432BA is Out Of Service (OOS),  it is busy to incoming 
calls. In the Test (option) setting, the modem drives pin 25 high when 
the modem is in Test mode. In the OOS (default) setting, the computer  
or terminal forces pin 25 high and put the modem in a busy condition. 
Note that jumper (shorting) plugs are not shipped with the MT1432BA, 
but are provided by Multi-Tech's Tech Support group on request.  
  
	       Test/OOS Jumper         Test/OOS Jumper     
	"OOS" (OOS "Input") Position    "Test" (OOS Output) 
Position  
	(Default Setting)               (Option Setting)  
  
8.5     MI/MIC Jumper  
The MT1432BA is available with a modified dial-up phone line 
interface, called the "MI/MIC" option. The  MI/MIC jumper enables or 
disables the Mode Indicate/Mode Indicate Common (MI/MIC) interface. This  
option is for applications where the modem's dialing capability is not 
used, and dialing is done by an  external device (such as an 801 dialer, 
a computer, or a PBX/CBX system dialer).   
To activate the MI/MIC option, first move the two jumper plugs in the 
MIC position. The command $MI,  then controls this function.  
Entering AT$MI1 enables MI/MIC operation.To disable the MI/MIC option,  
place the two shorting plugs in the MI position and enter AT$MI0 
(default).
  
	MI/MIC Option Jumper    MI/MIC Option Jumper  
	MI/MIC Option Disabled  MI/MIC Option Enabled  
	(Factory Default Setting)        (Option Setting)         
  
Note that jumper (shorting) plugs are not shipped with the MT1432BA, 
but are provided by Multi-Tech's  Tech Support group on request.   
  
  
8.6     Dial/Leased Line Switch  
The two-position DIAL/LEASED  "flip" switch is used (in conjunction 
with DIP-Switches #5 and #10) to  select the type of phone line connection 
(either dialup or leased line).  Refer to section 3.3 for more  
information on phone line connections. The DIAL/LEASED switch is 
located adjacent to the 16-position  DIP-Switch (see Figure 8-1).   
For leased line operation, select the LEASED position. For dial-up line 
operation, select the DIAL position.  The DIAL position is the factory 
default setting.  
  
	DIAL                               DIAL  
		  
	LEASED                             LEASED  
		  
	DIAL/LEASED Switch              DIAL/LEASED Switch  
	DIAL Position                   LEASED Position  
	(Factory Default Setting)       (Option Setting)   
  
8.7     Speaker Volume Control  
You can adjust the volume of the MT1432BA's phone-line monitor 
speaker with the volume control knob, located on the back of the modem 
next to the RS232C connector.  Turn the knob clockwise to increase the 
modem's volume and counterclockwise to decrease volume.  
  
8.8     Notes on Your Option Configurations  
This section lets you record any changes you may have made to the 
DIP-switch settings.  Circle the appropriate setting and record the effect 
for future reference.  
DIP-Switches  
     Switch            Function                     Position        Effect  
	#1      Force DTR/DTR from Interface*         UP*          
						     DOWN  
	#2      Flow Control &E4*/&E5                 UP*          
		(Async/Dial-Up/Leased Line)          DOWN  
	#2      SDLC*/BSC (Sync)                      UP*          
						     DOWN  
	#3      Result Codes Enable*/Disable          UP            
		(Async/Dial-up)                      DOWN*  
	#3      DbM Transmit 0 dB*/-10dB              UP           
		(Async/Sync/Lease-Line)              DOWN*       
	#4      UUCP Enable/Disable*                  UP*               
		 (Async/Dial-Up/Leased Line          DOWN  
	#4      AS/400 Enable/Disable*                UP*         
		(Sync/Dial-Up/Leased line)           DOWN  
	#5      Auto-Answer Enable*/Disable           UP*          
		Async/Sync/Dial-Up)                  DOWN  
	#5      Originate/Answer*                     UP*            
		(Async/Sync/Leased Line)             DOWN  
	#6      Max-Thru Enable*/Disable              UP*            
		(Async/Dial-Up/Leased)               DOWN  
	#6      Slave Clock Enable/Disable*           UP*           
		(Sync/Dial-Up/Leased)                DOWN  
	#7      RTS/Normal/Forced*                    UP            
		(Sync/Async/Dial/Leased)             DOWN*  
	#8      Command Mode Enabled*                 UP           
		(Sync/Async/Dial/Leased)             DOWN  
	#9      Local/Remote* LoopBack                UP          
		(Async/Sync/Dial/Leased)             DOWN*  
	#10     Dial-Up*/Leased-Line                  UP*         
						     DOWN              
	#11     "AT"/"Multi-Tech" Result Codes*       UP          
		 (Asynchronous)                      DOWN*  
	#11      Internal*/External Clocking          UP         
		 (Synchronous)                       DOWN*  
	#12      Sync/Async Mode*                     UP              
						     DOWN*         
DIP Switches #13-16  
Switch      Position               Effect  
	#13/#14 UP      14400 bps Operation  
		UP*  
	#13/#14 DOWN    9600 bps Operation  
		UP  
	#13/#14 UP      4800 bps Operation  
		DOWN  
	#13/#14 DOWN    2400 bps Operation  
		DOWN  
	#15     UP*     CD/DSR from Interface (Sync/Async)  
	#15     DOWN    CD/DSR Forced On  
	#16     UP      Not  
	#16     DOWN    Used  
  
  
  
  
*Factory Default Setting 
 
 
Appendix C  
Command Summary  
COMMAND       VALUES                  DESCRIPTION  
AT                        Attention Code that precedes most command 
			  strings except A/, A: and Escape Codes.  
  
RETURN                    Pressing RETURN key executes most  
			  commands.  

$                         This symbol placed in dialing string enables 
			  the modem to detect AT&T's "call card" tones for  
			  accessing user's calling card to                                
			  originate an on-line connection.  

A                         Answer call, even if no ring present.  

A/                        Repeat last command.  (Do not precede this  
			  command with AT.  Do not hit RETURN to  
				execute.)  

A:                        Continuous redial (10 redials in DOC units) of  
			  last number until answered.  (Not used  
			  Internationally.)  

$An     n = 0 or 1     ***$A0 discards data during auto-reliable time  
			  period.  
			  $A1 buffers data during auto-reliable time  
			  period.  

#An     n = 0 thru 3   ***#A0 selects initial handshake at 14400 to                                 
			  12000 to 9600  to 4800 to 2400 to 1200 to                       
			  300 bps.                 
			  #A1 selects initial handshake at 14400 bps              
			  only.  
			  #A2 selects initial handshake at 14400 to  
			  9600 to 4800 bps.  
			  #A3 selects initial handshake at 2400  to 
			  1200 to 300 bps.  
  
Bn      n = 0 or 1     ***B0 selects V.21 answer tone.  
			  B1 selects Bell answer tone.  

&Bn     n = 0 or 1     ***&B0 means normal transmit buffer 
			  size.  
			  &B1 means reduced transmit buffer size.  

&BSn    n = 0 or 1        &BS0 means maximum transmit block size of  
			  64 characters.  
		       ***&BS1 means maximum transmit block size of  
			  256 characters.  

$BAn    n = 0 or 1     ***$BA0 means speed conversion is on.  
			  $BA1 means speed conversion is off.  

&Cn     n = 0, 1,         &C0 forces Carrier Detect on.  
	2, or 4        ***&C1 lets Carrier Detect act normally.  
			  &C2 lets Carrier Detect drop S24 time on  
			  disconnect.  
			  &C4 resets modem when Carrier Detect    
			  drops.  

Ds       s = phone #      Dial a telephone number "s," where s may  
			  include up to 60 digits or T, P, R, comma  
			  and ; characters.  

DsNd    s = phone #       Store telephone number. To store, phone           d = 0 thru 9     
			  number "s" is entered and followed by N                 
			  and then Directory Number "d."  

&Dn     n = 0, 2, or 3   *&D0 DTR is ignored  
			  &D1 means modem returns to command  
			  mode.  
		       ***&D2 lets modem react to DTR normally.  
			  &D3 causes modem to reset to modem  
			  default parameters.  

$Dn     n = 0 or 1     ***$D0 disables DTR Dialing.  
			  $D1 enables DTR Dialing.  

En      n = 0 or 1        E0 means do not echo Command Mode  
			  Character.  
		       ***E1 means do echo Command Mode  
			  characters.  

&En     n = 0 thru 15     &E0 means no error correction.  
		       ***&E1 means V.42 Auto-reliable Mode.  
			  &E2 means V.42 Reliable Mode.  
			  &E3 means no modem-initiated flow control.  
		       ***&E4 means CTS modem-initiated flow control.  
			  &E5 means Xon/Xoff modem-initiated flow control.  
		       ***&E6 means Xon/Xoff not passed through.  
			  &E7 means Xon/Xoff passed through.  
		       ***&E8 means Enq/Ack pacing off.  
			  &E9 means Enq/Ack pacing on.  
		       ***&E10 means Normal Mode flow control off.  
			  &E11 means Normal Mode flow control on.  
		       ***&E12 means Pacing off.  
			 *&E13 means Pacing on.  
			 &E14 means data compression disabled.  
		      ***&E15 means data compression enabled.  

$EBn    n = 0 or 1    ***$EB0 enables 10 bit mode.  
			 $EB1 enables 11 bit mode.  
  

%En     n=0 thru 5      %E0 = Modem Won't Escape.  
		     ***%E1 = +++ Method (default setting).  
			%E2 = Break Method.  
			%E3 = Either +++ or Break Method.  
			%E4 = No "OK" Response to +++  
			%E5 =  "OK" Response to +++  

#Fn     n = 0 thru 2     #F0 means no fallback when on-line.  
			 #F1 means fallback from 14400 to 4800 bps  
			 when on-line.  
		      ***#F2 means fallback to 4800 bps from 14.4K       
			 bps/fall forward when line improves.  
			  

&Fn     n = 0, 8 or 9    &F loads factory default values from ROM.  
		      ***&F8 reads factory default values and switch     
			 settings when &F is issued.  
			 &F9 reads parameters stored in non-volatile     
			 memory when &F is issued.  
  

$Fn     n = 0 or 1       $F0 means do not fall back to normal  
			     connect if CR received.  
		      ***$F1 means fall back to normal connect if CR  
			     received.  
&Gn     n = 0, 1 or 2   ***&G0 turns off CCITT guard tones.  
			   &G1 turns on CCITT 550 Hz guard tone.  
			   &G2 turns on CCITT 1800 Hz guard tone.  

Hn      n = 0 or 1         H0 means Hang Up (go on hook).  
			   H1 means Go Off Hook.  

$Hn     n = 1 thru 3       $H1 brings up Help Screen #1.   
			   $H2 brings up Help Screen #2.  
			   $H3 brings up Help Screen #3.  

In      n = 0,1 or 2      I0 displays Multi-Tech generic modem ID #.  
			  I1 displays firmware revision #.  
			  I2 displays modem model number.  

L                       Lists all stored telephone numbers in memory.  
L5                      L5 lists all current operating parameters.  
L6                      L6 lists all current S-Register values.  
L7                      L7 lists additional parameters.  
L8                      L8 lists on-line diagnostics.  

#Ln   n = 0 thru 3    ***#L0 means modems negotiate V.42 Mode.  
			 #L1 means MNP on and LAP-M off.  
			 #L2 means LAP-M on and MNP off.  
			 #L3 means no detection phase but go directly   
			 to LAP-M.  

Mn      n = 0 thru 3     M0 means Monitor speaker always Off.  
		      ***M1 means Monitor speaker On until carrier   
			 detected  
			 M2 means Monitor speaker always On.  
			 M3  Monitor speaker on during dialing/off       
			 during handshaking.  

$MBn    n = speed        $MB75 selects CCITT V.23 mode.  
			 $MB300 selects 300 bps on-line.  
			 $MB1200 selects 1200 bps on-line.  
			 $MB2400 selects 2400 bps on-line.  
			 $MB4800 selects 4800 bps on-line.  
			 $MB9600 selects 9600 bps on-line.  
		      ***$MB14400 selects 14400 bps on-line.  
		  

&Mn     n = 0 or 1    ***&M0 selects Async when on-line.  
			 &M1 selects Sync when on-line.  
  

$MIn    n = 0 or 1    ***$MI0  disables MI/MIC option  
			 $MI1 enables MI/MIC option  
  

Nd    d = 0 thru 9       Dial stored telephone number "d" (Do not  
			 include the letter D in this command.)  

NdNe    d = 0 thru 9      Number Linking. If first number dialed is  
	e = any other     busy, another stored number may be  
	number 0          automatically dialed. In example, stored  
	thru 9            number d is dialed, and if busy, stored  
			  number e is dialed.   

O                          Exit Command Mode and go into On-Line  Mode.  

P                       ***Modem will pulse-dial numbers following  
			   the P.  

&Pn     n = 0 or 1     ***&P0 means 60-40 pulse ratio.  
			  &P1 means 67-33 pulse ratio.  

Qn      n = 0, 1 or 2  ***Q0 means Result Codes sent.  
			  Q1 means Result Codes will be suppressed  (quiet).  
			  Q2 means Dumb Answer Mode.  

&Qn     n = 0 or 1     ***&Q0 selects "Multi-Tech" command set.  
			  &Q1 selects "AT" command set.  

Rn      n = 0 or 1     ***R0 means modem will not reverse modes.  
			  R1 means modem will reverse modes.  

&Rn     n = 0, 1 or 2     &R0 lets Clear to Send act normally.  
		       ***&R1 forces Clear to Send on.  
			  &R2 drops for 1 second on disconnect.  

$Rn     n = 0 or 1     ***$R0 means disconnect after 12 retransmits.  
			  $R1 means do not disconnect after 12  
			  retransmits.  

&RFn    n = 0 or 1        &RF0 selects CTS follows RTS.  
		       ***&RF1 selects CTS to act independently  

Sr=n    r = 0-11, 13,     Sets value of Register "r" to value of "n",    
	15-17,            where "n" is entered in Decimal format.         
	24-26, 29, 30,    
	32, 34...                 

Sr?     r = 0-11, 13,       Reads value of Register "r" and displays  
	15-17, 24-          value in 3-digit Decimal format.  
	26, 30, 32 or  
	34...  
  

$SBn    n = speed       $SB300 selects 300 bps at serial port.  
			$SB1200 selects 1200 bps at serial port.  
			$SB2400 selects 2400 bps at serial port.  
			$SB4800 selects 4800 bps at serial port.  
			$SB9600 selects 9600 bps at serial port.  
			$SB19200 selects 19,200 bps at serial port.  
			$SB38400 selects 38,400 bps at serial port  
		     ***$SB57600 selects 57,600 bps at serial port.  
		  

&SFn    n = 0 or 1    ***&SF0 selects DSR follows CD.  
			 &SF1 selects DSR independent.

&Sn     n = 0, 1 or 2    &S0 forces Data Set Ready On.  
		      ***&S1 lets Data Set Ready act normally.  
			 &S2 Data Set Ready drop is regulated by  
			     S24 on disconnect.  

$SPn    n = 0 or 1     ***$SP0 disables UUCP Spoofing  
			  $SP1 enables UUCP Spoofing  
			  Modem will tone-dial numbers following the T.  

&Tn     n = 4 or 5        &T4 means Enable Response to Request for  
			  Remote Digital Loopback.  
		       ***&T5 means Disable Response to Request for  
			  Remote Digital Loopback.  

#Tn     n = 0 or 1        #T0 turns off Trellis Coded Modulation  
		       ***#T1 turns on Trellis Coded Modulation  

Un      n = 0, 1, 2,      U0 places modem in Analog Loop Originate  
	or 3              Mode.  
			  U1 places modem in Analog Loop Answer  
			  Mode.  
			  U2 places modem in Remote Digital Loopback   
			  test mode.  
			  U3 places modem in Local Digital Loopback  
			  test mode.                      

$VDn    n= 0 or 1         $VD0 disables Voice/Data Dialing        
			  $VD1  enables Voice/Data Dialing  
  

Vn      n = 0 or 1         V0 means Result Codes sent as digits  
			   (terse response).  
			***V1 means Result Codes sent as words  
			   (verbose response).  

W                          Wait for new dial-tone.  

&Wn     n = 0 or 1         &W0 causes modem to store its current  
			   parameters in non-volatile RAM, and  
			   modem will load these for future sessions  
			   instead of reading factory ROM defaults,   
			   unless &F command used.  
			***&W1 causes modem to not store parameters.  

Xn      n = 0, 1, 2,    ***X0 selects Basic Result Codes  
	3 or 4             (w/o CONNECT 1200, CONNECT 2400).  
			   X1 selects Extended Result Codes  
			   (w/CONNECT 1200, CONNECT 2400).  
			   X2 selects Standard AT Command set with   
			   NO DIAL TONE.  
			   X3 selects Standard AT Command set with   
			   BUSY.  
			   X4 selects Standard AT Command set with   
			   NO DIAL TONE and BUSY.  

#Xn     n= 0 or 1      ***#X0 selects single XOFF character sent until                       
			  XON level returns.  
			  #X1 selects multiple XOFF characters after      
			  buffer level is full.  

Yn      n = 0 or 1    ***Y0 disables sending or responding to long  
			 space "break".  
			 Y1 enables sending or responding to long  
			 space "breaks".  

Z                        All configuration parameters are reset to       
			 default values.  

COMMAND                                                   DESCRIPTIONS  

,        in Dial         Causes pause during dialing.  
	 command  

;        in Dial         Causes return to Command Mode after  
	 command         dialing.  

!       in Dial          Causes modem to flash On-Hook.  
	command  

@       in Dial         Causes modem to wait for ringback, then  5  
	command         seconds of silence before processing  
			next part of command.  

+++AT<CR>               In-band Escape Sequence.  Places modem in                         
			Command Mode while still remaining On-          
			Line.  Enter +++  followed by the letters A                            
			and T, up to ten command  characters, and                                        
			a RETURN.   

BREAK AT<CR>            Out-of-band Escape Sequence. Places                         
			modem in Command mode while still               
			remaining On- Line. Not  preceded by AT.                        
			Enter a BREAK  signal, followed by the                                         
			letters A and T, up to sixty command       
			characters, and hit RETURN.  
  
							  
	Callback Security/Remote Configuration Command          
			 Summary  
			 
 Command         Description  

#DBn             #DB0 disables Callback Security and answering Yes 
		 to the prompt turns off Callback  Security and erases 
		 stored phone numbers and passwords.  Answering No to 
		 the prompt aborts the  command.          
		
		 #DB1 activates remote and local password security.  
		 #DB2 activates remote password security.  

#CBNyyxxxxxx      Callback password with xxxxxx being callback password 
		  and yy being the  memory location.  Callback password 
		  xxxxxx must start with a non-numeric character and 
		  upper/lower case  sensitive.  Callback password xxxxxx 
		  must be a minimum of 6 and maximum of 10 characters.  
		  yy memory  locations are from 0 to 29.  Must specify P 
		  (pulse) or T (tone) dialing in string.  

+ - Dxxxxxx???Nxx  Callback Phone Numbers xxxxxx with the + preceding 
		   the phone  number indicating the callback modem phone 
		   number for the corresponding password at the same memory  
		   location.  The (-) preceding the phone number enables 
		   direct entry when the caller uses the correct password 
		   without the callback modem having to return the call.  
		   The ??? entry at the en  d of the phone number represents 
		   an extension added to the main phone number.  The Nxx 
		   is the memory location of the callback phone number and 
		   password.  

Command                        Description  

#Pn                Parity of the prompt messages sent by the callback modem.  
		   #P0 is no parity  
		   #P1 is odd parity  
		   #P2 is even parity  

#RCBNxx            Erases the callback password stored at memory location 
		   xx.  Memory locations  are 0 to 29.  

#RDNxx             Erases the callback phone number stored at memory location 
		   xx.  Memory  locations are 0 to 29.  
  
  
		Password  Command Summary  
 
 Command                     Description  

#Ixxxxxxxxxx      Login Password is any keyboard characters (x) (upper/
		  lower case sensitive), minimum 6  and maximum 10 characters.   
		  The default Login Password is MULTI-TECH.    

#Syyyyyyyyyy      Set-up Password is any keyboard characters (y) (upper/
		  lower case sensitive),  minimum 6  and maximum 10 
		  characters.  The default Set-up Password is MODEMSETUP.  
		  
		  V.25bis Commands                           
      
      Command              Description  
	
$Vn               $V0 returns modem to AT command mode when in V.25bis mode.  
		  $V1 enables V.25bis mode of operation.   
		  $V2 allows modem to receive one V.25bis command 
		  while in AT command mode without leaving AT command mode.  
		  $V5 DSR follows DTR in V.25bis mode.  
		  $V6 DSR does not follow DTR in V.25bis mode.  

CLAmm             Clears the phone number memory location mm.  Phone 
		  numbers are stored in memory locations 00 to 19.  

CSPs              Changes the serial bps rate. 
		  CSP0300 - 300 bps  
		  CSP1200 - 1200 bps  
		  CSP2400 - 2400 bps        
		  CSP4800 - 4800 bps  
		  CSP9600 - 9600 bps  
		  CSP19200 - 19200 bps  
		  CSP38400 - 38400 bps  
		  CSP57600 - 57600 bps                            
		  CSP115200 - 115200 bps  

CRNdd             Dials phone number dd where dd can be up to 20 
		  characters (0 through 9, *, #, P, T and  :). Phone 
		  number is checked against the Delayed and Forbidden 
		  Number lists before dialed.  
	      
      Command                   Description  
	
CRIdd;nn              Dials dd same as CRN Command and ignores nn 
		      identification string.  

CRSmm                 Dial stored phone number at memory location mm.  
		      Phone numbers are stored in memory  locations 00 to 
		      19.  Phone number is checked against the Delayed and 
		      Forbidden Number lists before  dialed.  

PRNmm;dd              Store phone number in memory location mm followed 
		      by a semicolon (;) and the phone number dd in which 
		      you wish to store.    

RLN                   Displays all phone numbers stored in memory.  

RLD                   Displays the delayed phone numbers stored in memory.  
		      The delayed phone numbers listing can contain up to 
		      eight phone numbers.  
		      
RLF                   Displays the forbidden phone numbers stored in memory.  
		      This listing can be up to eight  phone numbers.    

DIC                   The disregard or connect to incoming calls  
		      or commands are used for auto-answer CIC operations.  
		      DIC stops the modem from answering incoming calls.  
		      CIC causes the modem to answer incoming calls.  
  
  
Appendix D  
DIP-Switch Summary  
DIP-Switch      Condition                         Effect                          
Asynchronous Mode  
  
#1      *UP                     DTR dependent on interface  
	Down                    DTR forced On at all times  

#2      *UP                     Hardware Flow Control  
	Down                    Xon/Xoff Flow Control  

#3       UP                     -10 dB Transmission (leased line)  
	*Down                   0 dB Transmission (leased line)  

#4      *UP                     UUCP Spoofing Off  
	Down                    UUCP Spoofing On  

#5      *UP                      Automatic Answer On  
	Down                     Automatic Answer Off  

#6      *UP                     Max throughput On  
	Down                    Max throughput Off  

#7      UP                      RTS dependent on Interface  
	*Down                   RTS forced On at all times  

#8       UP                     Disable Command Mode  
	*Down                   Enable Command Mode  

#9       UP                     Local Digital Loopback On  
	*Down                   Remote Digital Loopback On  

#10     *UP                     Dial-Up Operation  
	Down                    Leased Line Operation  

#11      UP                     "AT" Responses  
	*Down                   "Multi-Tech" Responses  

#12      UP                     Synchronous Mode On  
	*Down                   Asynchronous Mode On  
  
  
DIP-Switch      Condition       Effect  

Synchronous Mode  
  
#1      *UP                     DTR Dependent On interface  
	Down                    DTR forced On at all times  

#2      *UP                     SDLC Mode On  
	Down                    BSC Mode On  

#3       UP                     Command Mode Response Off  
	*Down                   Command Mode Response On  

#4      *UP                     AS/400 Mode Off  
	Down                    AS/400 Mode On  

#5      *UP                     Answer Mode On  
	Down                    Originate Mode On  

#6      *UP                     Slave Clocking Off  
	Down                    Slave Clocking On  

#7       UP                     RTS Dependent on interface  
	*Down                   RTS forced on at all times  

#8       UP                     Command Mode Off  
	*Down                   Command Mode On  

#9       UP                     Local Digital Loopback On  
	*Down                   Remote Digital Loopback On  

#10     *UP                     Dial-Up Operation       
	Down                    Leased  Line Operation  

#11      UP                     External Clock selected  
	*Down                   Internal Clock selected  

#12      UP                     Synchronous Mode On  
	*Down                   Asynchronous Mode On 
 
 
Appendix E  
S-Register Summary  
S-REGISTER      UNIT    RANGE   DEFAULT         DESCRIPTION  
     S0        1 ring    0-255     1         Sets number of rings before  
					     modem answers.  
     
     S1        1 ring    0-255     0         Counts rings which have occurred.  
     
     S2        ASCII     0-127     43        Sets Escape Code character  
					     (default is plus + sign).  
     
     S3        ASCII     0-127     13        Sets character recognized as        
					     RETURN (default is CTRL-M).  
     
     S4        ASCII     0-127     10        Sets character recognized as   
					     LINE FEED (default is CTRL-J).  
     
     S5        ASCII      0-32      8        Sets character recognized as  
			  127                BACKSPACE (default is CTRL-H).  
     
     S6      1 second    2-255      2        Determines wait-time for  
			 4-255**    4**      dial tone.  
     
     S7      1 second    1-255     45        Determines how long modem  
			 1-45*               waits for carrier before  
					     aborting call.  
     
     S8      1 second    0-255      2        Sets pause time caused by a  
			 4-255**    4**      comma character in a dial  
					     command.  
     
     S9      100 mSec    1-255       6       Sets carrier detect response  
					     time.  
     
     S10     100 mSec    1-255       7       Sets delay time between when  
					     carrier is lost and when modem  
					     disconnects.  
     
     S11     1 mSec      1-255       70      Sets time duration of and  
			 80-255*     80*     spacing between tones in  
					     tone-dialing.  
     
     S13     ASCII       0-127       37      Defines Remote Configuration  
					     Escape Character  
     
     S15     Sec         10-255      20      Defines time delay for  
					     Callback attempts after initial                 
					     passwords have  exchanged.  
  
     S16     1 Attempt   1-255       4       Defines the number of Callback                       
					     attempts after initial passwords 
					     have exchanged between modems.  
	  
     S17     10 mSec     0-2.5   250 mSec    Defines length of break   
					     time (space) to PC.  
  
    S24     50 mSec      0-255    20         Sets DSR/CTS/CD dropout time. 
					     Default (20) equals one second.  
    
    S25     100 mSec     0-255    0          Sets DTR dropout time.  
					     0 default equals 50 mSec.  
    
    S26      1           0-255    0          Specifies number of failed   
					     password attempts allowed.  
    
    S29      1           1-255    20         Specifies the amount of idle time                                
					     can elapse between AT com-              
					     mands after the SETUP                                   
					     password  has been entered.  
    
    S30     min          0-255    0          Inactivity timer used to 
					     disconnect  modem.      
    
    
    S32     100mSec      0-255    20         Sets time that modem                            
					     waits for a <RETURN> to be      
					     entered during escape                           
					     sequence execution.  
    
    S34     ASCII        0-60     10         Buffer size for number of   
					     characters in AT command                          
					     string after on-line escape     
					     sequence, before buffer is                      
					     cleared and escape sequence 
					     aborted.  
    
    S36     1 second     0-255     0         S36 sets the time between DTR                              
					     inactive and the modem                  
					     going off-hook (busy-out).  
    
    S37     1 second     0-255     5         S37 sets the time allowed DTR                              
					     active and the modem                    
					     responding on-hook (not busy).    
 
 
Appendix F  

Result Code Summary  

     (TERSE)   (VERBOSE)         
     
     DIGIT   WORDS              EFFECT  
      0       OK               Command was executed without error; ready  
			       for next command.  
      
      1       CONNECT          Modem has detected carrier and gone on-line.  
      
      2       RING             Modem has detected ring caused by incoming        
			       call.  
      
      3       NO CARRIER       No carrier signal has been detected 
			       within allowed time.  
      
      4       ERROR            Error in Command line (too many, or invalid  
			       characters).  
      
      5       CONNECT 1200     Modem has detected carrier at 1200 bps and 
			       gone on-line.  
      
      6       NO DIAL TONE     No dial tone has been detected.  
      
      7       BUSY             A busy signal has been detected.  
      
      8       NO ANSWER        Remote system did not answer.  
      
      9       CONNECT 2400     Modem has detected carrier at 2400 bps and 
			       gone on-line.  
      
      11      CONNECT 4800     Modem has detected carrier at 4800 bps and 
			       gone on-line.  
      
      12      CONNECT 9600     Modem has detected carrier at 9600 bps and 
			       gone on-line.  
      
      13      CONNECT 14400    Modem has detected carrier at 14400 bps and 
			       gone on-line.  
      
      23      CONNECT 1275     Modem is connected in V.23 mode.  
  
Note: If MT1432BA is used in Reliable mode, the following responses 
change:  
		1R      CONNECT RELIABLE          
		5R      CONNECT 1200 RELIABLE     
		9R      CONNECT 2400 RELIABLE     
		11R     CONNECT 4800 RELIABLE     
		12R     CONNECT 9600 RELIABLE     
		13R     CONNECT 14400 RELIABLE    
	  
 If MT1432BA is used in LAP-M reliable mode, the following 
responses change:  
		1L      CONNECT LAPM              
		5L      CONNECT 1200 LAPM         
		9L      CONNECT 2400 LAPM          
		10L     CONNECT 4800 LAPM         
		12L     CONNECT 9600 LAPM         
		13L     CONNECT 14400 LAPM         
	  
Note 1: If the MT1432BA is used with data compression, the word 
COMPRESSED or the letter C is added  
to result codes.   
  
Note 2: If the Standard "AT" Command Set 2400 responses are 
selected with the &Q command, the  
following responses change:  
  
	9               (not used)  
	10      CONNECT 2400    Modem has detected carrier at 2400 
				bps and gone on-line.  
 
 
Appendix G  
V.25bis Operation  
Chapter 4 described a set of commands which let the MT1432BA dial, 
hang-up, and be configured for various applications.  However, these 
commands, the AT command set, are only functional when the DTE  
transmits data asynchronously.  That is, they cannot be used with 
synchronous equipment such as that found in IBM's Binary Synchronous 
Communications (BSC) and Synchronous Data Link Control (SDLC)*  
environments.    

The CCITT V.25bis commands provide you with an alternate set of 
commands and responses to those described in Chapter 4 for applications 
in which the DTE is synchronous. V.25bis commands support  
dialing functions in asynchronous or synchronous mode according to 
the recommendations of the CCITT (Consultative Committee of International 
Telephony and Telegraphy); however, the AT commands are  
understood to reign in the asynchronous world, while the V.25bis 
commands are relegated to the synchronous world of datacomm.  If you need 
to establish a datacomm link over Public Switched Telephone  
Network (PSTN) dial-up services, and your equipment outputs a 
synchronous data stream, V.25bis  commands are essential.  

V.25bis mode AT commands do not include any modem configuration commands. 
You can execute normal AT commands in V.25bis mode for modem configuration.  
Delayed and Forbidden Numbers V.25bis provides the facility to delay failed 
call retry attempts by putting numbers that failed to connect on  
a special Delayed Number list. Subsequent dialing of these numbers 
will be delayed (time specified by a country regulation) and an appropriate 
message displayed. If the number is retried more than the maximum  
allowed number of times (number is also specified by country 
regulation), it is placed on the Forbidden  Numbers list, and no further 
retries will be allowed. When the Forbidden Numbers list is full, no dialing
is  allowed and a CFIFF indication is given. The modem in AT command 
mode will respond with NO CARRIER. If country regulations require that the
Forbidden Numbers list be checked in AT mode, then NO CARRIER will be the 
response to a dial attempt in AT mode. Numbers will also be put on the 
Forbidden Numbers list if the Delayed Numbers list is full and a new number 
fails for the first time. In that case, the new number will be added to the 
Delayed Number list and the oldest existing number added to the Forbidden 
Numbers list. Numbers are removed from the Forbidden Numbers list by after 
a certain time has past (also by country regulation). Some country 
regulations have numbers remain on the Forbidden Numbers list permanently. 
The Delayed Number and Forbidden Numbers lists are eight numbers long (20  
characters each).  

V.25bis Operation  
Operation in V.25bis mode is similar to AT command mode in that certain DIP 
switch functions are important to its operation. V.25bis does not include 
any speed detection for asynchronous mode, so when you are giving commands, 
you must stay in your initial speed (i.e., if you change your terminal speed 
while entering an AT command, you will get no responses). In synchronous 
mode, the modem supplies the clock, to the synchronous terminal "knows" the 
speed.  You must be in V.25bis mode for the commands described here to 
function. Most AT commands will also function, except those associated with 
dialing such as ATD, ATN, ATO, and ATU. To get into V.25bis mode, you type 
AT$V1. At this point your modem does no more speed or parity detection 
(things  associated with asynchronous operation). To get out of V.25bis mode 
and back into AT command mode, enter AT$VO. The AT$V2 command allows you 
to run one V.25bis command from AT command mode without leaving AT command 
mode.  
There is no command to select between asynchronous and synchronous V.25bis 
operation. The position of DIP-Switch #12 selects between modes. For 
synchronous mode, DIP-Switch #12 must be UP, and the AT command mode enabled. 
Another asynchronous mode concern is the problem of connecting at a different 
speed than the speed at which the serial port is set. If your modem port 
speed is different from the serial port speed, you must  either:  


	1.      Enable speed conversion and have flow control on, or  
	2.      Enable connect responses (with the ATX1 command) and                     
		change  the serial baud rate after receiving a connect   
		message.  

DTR dialing is functional in V.25bis mode, except the number dialed is 
from the V.25bis mm memory  location 01. Also, if the $VD1 command is 
entered when in Auto-Answer mode, the modem answers immediately upon 
receiving the first ring.  There is no disconnect message (NO CARRIER) 
if a normal connection is made.  

V.25bis Set-Up and Initialization  
Before you operate your modem in the V.25bis mode, you need to make sure 
it is set-up properly (various RS232 lines such as DSR and CTS act as 
specified in the V.25bis standard). Set-up involves proper DIP- 
Switch settings, jumper plug settings and soft-switches (software 
controlled conditions).  
  
V.25bis DIP-Switches  
	#1 - Unforced DTR  
	#2 - NA  
	#3 - NA  
	#4 - NA  
	#5 - Auto-Answer enabled  
	#6 - Async - Max throughput set Sync - Slave Clocking                           
	#7 - RTS unforced                                                    
	#8 - Command Mode  forced                                                  
	#9 - Digital Loopback Off                     
	#10 - Dial-Up                   
	#11 - Async - "AT"/"Multi-Tech" Resp.                   
	#12 - Async/Sync mode set per requirements  
  
V.25bis  Mode AT Commands  
The following commands will either alter standard V.25bis behavior (so 
you must be careful in their use) or they are not allowed, as indicated. 
All other commands can be used in V.25bis operation.  
	A               Not Allowed  
	A/              Not Allowed  
	A:              Not Allowed  
	D               Not Allowed  
	D...N           Not Allowed  
	$D              Alters Operation ($D1 in V25bis is direct 
			call mode)  
	E               Alters Operation  
	&F              Alters Operation (removes modem from   
			asynchronous V.42bis mode)  
	N               Not Allowed  
	N...N           Not Allowed  
	O               Not Allowed  
	P               Not Allowed  
	T               Not Allowed  
	U               Not Allowed  
	W               Not Allowed  
	X               Alters Operation (X0 no connect message)   
					 (X1 connect message)  
	,               Not Allowed  
	;               Not Allowed  
	!               Not Allowed  
	@               Not Allowed  
	+++AT<CR>       Not Allowed  
	
	V.25bis Responses (Result Codes)  
When in V.25bis mode (the AT$V1 command executed), your modem provides  
you with several responses  which can help you follow the progress of 
V.25bis operations. These are similar to the Result Codes associated with 
AT Command mode operation. The V.25bis responses are in the form of 
three-character mnemonics as listed below:  
	INC               Incoming Call (same as RING indicator)  
	VAL               A valid V.25bis command has been attempted  
	DLCt              Call delayed for t minutes (number on   
			  Delayed list)  
	CFlrr             Call failure indicator where rr equals:  
			  et - Engaged tone (same as BUSY)  
			  nt - Call Answered but No Answer Tone  
			  ab - Call Not Answered  
			  fc - Number on Forbidden List  
			  ns - Number not stored in memory  
			  ua - User Abort  
			  nd - No Dialtone  
			  ff - Forbidden List full  
	LSNmm;dd...dd   Phone number in V.25bis memory  
	LSDmm;dd...dd   Phone number on the Delay list  
	LSFmm;dd...dd   Phone number on the forbidden list  
	CON ssss        Connection at ssss speed (if X1 in 
			effect)  
V.25bis AT Commands  
The AT commands associated with V.25bis mode are described as 
follows. Note that one command enables and disables V.25bis mode and 
the rest are only operable in the V.25bis mode.  

Enable/Disable V.25bis Mode ($V) Command  The function of the $V 
command is to select the V.25bis mode in asynchronous mode. (Synchronous 
mode is set up with switches. For example, the modem could be in AT 
command mode, (AT$V1), and if synchronous mode is enabled with AT 
Command mode enabled, then V.25bis mode is selected). Prior to  
executing this command, make sure that your modem is properly set up 
to perform the type of operation you will be performing. Refer to the 
initialization section of this appendix for information about modem set-up. 
When in V.25bis mode, most normal AT commands will also function  
(except D,N,O and U). V.25bis operates in asynchronous or 
synchronous modes (depending on the position of  DIP-Switch #12), and does 
not check for terminal speed (so do not change speeds while in this mode) or  
parity. In synchronous mode, speed is not important since the internal 
clocks provide synchronization. To place your modem in V.25bis mode from 
asynchronous mode, enter the AT$V1 command. To return to  AT command 
mode, enter the AT$V0 command. AT$V2 allows you to run one V.25bis 
command from AT command mode without leaving AT command mode (the V.25bis 
command follows $V2 on the command line).  

Clear Number in Memory (CLA) Command  
The CLA command clears a specific number in the mm phone number 
memory by entering CLAmm.  Change Serial Baud Rate (CSP) Command  
The CSP command will change the serial baud rate of your modem by 
entering CSPsssss where sssss can  equal:  
	
	0300    =       300 bps  
	1200    =       1200 bps  
	2400    =       2400 bps  
	4800    =       4800 bps  
	9600    =       9600 bps  
	19200   =       19200 bps  
	38400   =       38400 bps                               
	57600   =       57600 bps  
	    
		  
	  
Dial Phone Number Provided (CRN) Command  
The CRN command permits the dialing of the phone number immediately 
following it (from the command line). It is similar to the D command of 
the AT command set, except that the number is first checked against  
the Delayed Number and Forbidden Number list. If permitted, 
depending on the country regulations in effect, the number will then be 
dialed. For example, if you enter CRN7859875 and hit RETURN, your  
modem will check the two lists. If the number is on the Delayed 
Numbers list, you can dial that number again after t minutes have passed. 
If the number is on the Forbidden list, a CFIFC message will be displayed.  
You can use various commands from the AT command set within the 
CRN command line to facilitate the  dialing process, such as P, T, or : 
for pulse dialing, tone dialing and wait for dial tone. V.25bis supports  
"smart" dialing.  
To dial a phone number, enter CRNdd...dd where dd...dd is the phone 
number, which can be up to 20  characters long using any character on the 
telephone pad (0 through 9, *, #, P, T, and :).  
Some additional dialing characters may be available, based on country 
regulations.  

Dial Phone Number Stored in Memory (CRS) Command  
A telephone number that you have stored in the modem's memory may 
be automatically dialed after checking it against the Delayed and 
Forbidden number lists by entering CRSmm where mm = 01, 02, 03,  
04,....20. For example, a number stored in mm location 15 would be 
entered by CRS15 and hitting RETURN, then, if the number in mm memory 
location 15 is not on either list, it will be automatically  
dialed.  

Store a Phone Number in Memory (PRN) Command  
Your modem has a special V.25bis memory for storing phone numbers 
which you may dial by using the CRS command. The memory holds up to 
20 numbers of 20 characters each. You can store phone numbers  
in this memory with the PRN command. The format for the command is 
PRNmm;dd...dd where mm is the memory location at which you wish to 
store a number (any digits 01 through 20) followed by a semicolon(;)  
and then dd...dd (the number to be stored up to 20 digits long). The 
number can include punctuation as required.  To clear a number from 
the V.25bis memory, see the CLA command.  

Listing Numbers Stored in Memory (RLN) Command  
Telephone numbers that you have stored in the modem's V.25bis 
memory may be listed and displayed with the RLN command. It will display 
all twenty mm storage location numbers and associated telephone  
numbers with any command letters and punctuation imbedded in each 
number. The RLN command is similar to the L command of the AT command set. 
To list the V.25bis stored telephone numbers, enter RLN  and hit RETURN.  

Listing Delayed Phone Numbers (RLD) Command  
When a phone number is dialed either by a CRN or CRS command and 
a connection is not made, the number is entered in the modem's V.25bis 
Delayed Number list along with the number of retry attempts.  
Any further dialing attempts will be delayed some amount of time 
(determined by the regulations of each country). While the delay is in 
progress, the modem will give a DLC indication. The list contains eight  
numbers. When filled, the next number failing "bumps" off the oldest 
number on the list onto the Forbidden Number list. Numbers on the Delayed 
Number list that succeed in a connect attempt are removed. If a  
certain number of failed attempts occur (the number of failed attempts 
is specified by each country), the number is entered into the V.25bis 
Forbidden Phone Number List. Forbidden phone numbers cannot be  
dialed at all. To list the phone numbers on the V.25bis Delayed Phone 
Number List, enter RLD and hit RETURN.   

Listing Forbidden Phone Number (RLF) Command  
Those phone numbers that have failed to connect the required number 
of times as specified by country regulations are removed from the 
Delayed Number list and entered onto the V.25bis Forbidden Number list.  
Numbers on the Forbidden Number list cannot be dialed at all for some 
maximum amount of time, which is also specified by country regulations. 
In some countries, the time might be one hour, and in others the  
number may never be dialed again. The forbidden list is eight numbers 
long, with the newest number replacing the oldest if the memory is full. 
To list the numbers in the Forbidden list enter RLF and hit RETURN.  

Disregard or Connect to Incoming Calls (DIC or CIC) Command  
The Disregard or Connect to Incoming Calls commands are used for 
Auto-Answer operations. Depending on the country regulations, your 
modem will wait some amount of time or number of rings before answering  
the call. During that time, you can stop the modem from answering the 
call by entering the DIC (Disregard Incoming Calls) command. The CIC 
(Connect to Incoming Calls) command will cause your modem to  
answer the call (either reversing the effect of a DIC command or simply 
have your modem answer the call immediately without waiting the 
regulation time before answering).  DTR Dialing ($D) Command  
DTR Dialing is an alternate method of causing the MT1432BA to 
automatically dial a number. Data Terminal Ready (DTR) is a signal 
that comes into the modem from the terminal or computer to which it is  
connected via pin 20 of the RS232 interface. In DTR Dialing, the 
modem will automatically dial a stored number as soon as it receives 
a high DTR signal. The DTR Dialing method is popular when using the  
MT1432BA in synchronous applications. To enable DTR Dialing, enter the 
command AT$D1 and hit Return. The modem will now dial the phone  
number you have stored as N0 when it receives a high DTR signal (see 
the D...N command in Chapter 4). DTR must remain high for the 
duration of the call, until disconnect. To disable DTR Dialing,  
enter the command AT$D0 (or AT$D) and hit RETURN. When you use DTR 
Dialing, be sure that  DIP-Switch #1 is in the UP position, so that DTR 
is not forced on.  
In addition, when using DTR Dialing in a synchronous application, be 
sure that  DIP-Switch #8 is in the UP position to disable V.25bis 
Command mode.  CCITT V.25bis Country Specific Information  
Due to the flexibility of the V.25bis standard, each country may 
establish specific regulations governing the way operations are handled. 
The purpose of this document is to detail each country's specific regulations  
that affect operation of V.25bis in Multi-Tech modems.  
1.  Italy  
	a)      Command/Indication modifications  
		1.      Phone number indications include status ;ZPSTTT  
			a)      Z - U, D, or F, for Unrestricted, Delayed or                               
				Forbidden  
			b)      P - Delay time if delayed  
			c)      S - Number of retries so far  
			d)      TTT - Interdiction time to further attempts  
		
		2.      Modify RLN command to allow memory location   
			parameter  
			a)      RLNmm is now valid to list one number in 
				memory  
		
		3.      PRN and CLA commands do not work on active                           
			memory locations  
			a)      Active number are ones who are on the delay 
				or forbidden lists  
		4.      Added dialing digit '<<' to indicate 2 second pause  
	
	b)      Delayed and Forbidden list behavior  
		1.      5 retries without delay  
		2.      2 minute delay between next 4 retries  
		3.      After 9 retries the number is put on the 
			forbidden list  
		4.      120 minute timer is started on entry to delay 
			list  
		5.      When it runs out, the number is removed 
			from which ever list it is on  
	c)      Auto-Answer mode behavior  
		1.       Auto-Answer in 5 seconds if no DIC  
		2.      Get 10 seconds after DIC to enter CIC  
		3.      If 10 seconds times out then no connection is 
			possible  
2. Switzerland  
	a)      Command/Indication modification  
		1.      Modem must remain on-hook for 5 seconds 
			after disconnect  
		2.      Modem must remain on-hook for 5 minutes after 4   
			consecutive failed calls  
		3.      If modem must remain on-hook, then it is "paused"  
		4.      If the modem is paused and a call is 
			attempted a PAU indication is given.  
			a)      PAUt Modem is paused for t minutes  
	b)      Delayed and Forbidden list behavior  
		1.      2 minute delay between 4 retries  
		2.      After 4 retries the number is put on the 
			forbidden list  
		3.      The number remains on the forbidden list 
			forever  
	c)      Auto-Answer behavior  
		1.      Auto-Answer mode after 2 rings if no DIC  
 
3.      Austria  
	a)      Command/Indication modification (none)  
	b)      Delayed and Forbidden list behavior  
		1.      No delay between retries  
		2.      After 2 retries to numbers that answer, but 
			give no answer tone (CFINT), the number is 
			put on the forbidden list  
		3.      After 10 retries with busy or no dialtone, the 
			number is put on the forbidden list  
		4.      The number remains on the forbidden list forever  
		5.      Delayed and Forbidden Numbers lists are checked                                  
			when dialing in AT mode. If dialing is not possible 
			then NO CARRIER is the response.  
	c)      Auto-Answer behavior  
		1.      Auto-Answer in 5 seconds if no DIC  

4. France  
	a)      Command/Indication modification (none)  
	b)      Delay and Forbidden list behavior  
		1.      2 min. delay after 1st call, 4 after 2nd, 6 
			after 3rd, etc.  
		2.      After 5 retries, the number is put on the 
			forbidden list  
		3.      The number remains on the forbidden list forever  
		4.      Delayed and Forbidden Numbers lists are checked                                  
			when dialing in AT command mode. If dialing is not              
			possible then No Carrier is the response.  
	c)       Auto-Answer mode behavior  
		1.      Auto-Answer in 5 seconds if no DIC  
 
 5. Belgium  
	a)      Command/Indication modification (none)  
	b)      Delay and Forbidden list behavior  
		1.      1 min. delay between calls  
		2.      After 4 retries, the number is put on the 
			forbidden list  
		3.      The number remains on the forbidden list for 
			1 hour after entry to forbidden list  
		4.      Delayed and Forbidden Numbers lists are checked                                  
			when dialing in AT command mode. If dialing is not              
			possible then No Carrier is the response.  
	c)      Auto-Answer behavior  
		1.      Auto-Answer in 5 seconds if no DIC.  
6. Singapore  
	a)      Command/indication modifications  
		1.      Dialing digit '=' means wait for dialtone (acts 
			the same as ':' in dialing string).  
	b)      Delay and Forbidden list behavior  
		1.      5 retries without delay  
		2.      2 minute delay between next 4 retries  
		3.      After 9 retries the number is put on the 
			forbidden list  
		4.      120 minute timer is started on entry to delay list  
		5.      When it runs out, the number is removed from                             
			whichever list it is on. 
 
 
Appendix I  
RS232C Interface Specifications  
The MT1432BA's RS232C interface circuits have been designed to 
meet the electrical specifications given in EIA (Electronic 
Industries Association) RS232C standards. All signals generated by 
the modem are  approximately 10 volts when measured across a load of 
3000 ohms or greater. The receiving circuits of the modem will accept 
signals in the 3 to 25 volt range. The voltage thresholds are:  
	
	Negative = voltage more negative than 3 volts with respect to 
		   signal ground  
	
	Positive = voltage more positive than +3 volts with respect to 
		   signal ground  

SIGNAL INFORMATION:             NEGATIVE         POSITIVE   
Binary State                     One              Zero            
Signal Condition                 Mark             Space           
Control and  Timing Function      Off              On  
The input impedances of all modem circuits which accept signals from 
the data processing terminal or CPU equipment have DC resistances of 4.7K. 
For more specific details, consult the EIA RS232C standard itself.  

The following chart lists the EIA RS232C interface pins and circuits 
present on the MT1432BA's RS232C Interface connector. All other pins are 
unused.  
     Pin     Designation   eia      CCITT    signal   Function  
  assignment            circuit    circuit   source            
	1          pg       --        101     --      Protective Ground  
	2          SD       BA        103     DTE     Transmitted     
						      Data  
	3          RD       BB        104     DCE     Received Data  
	4          RTS      CA        105     DTE     Request to Send  
	5          CTS      CB        106     DCE     Clear to Send  
	6          DSR      CC        107     DCE     Data Set Ready  
	7          SG       AB        102     --      Signal Ground  
	8          CD       CF        109     DCE     Carrier Detect  
	9**        +v       +v        --      DCE     Test Voltage  
	12         HS       --        --      DCE     High Speed  
	15***      TC       DB        114     DCE     Transmit Clock  
	17***      RC       DD        115     DCE     Receive Clock  
	20         TR****   CD        108/2   DTE     Terminal Ready  
	22         RI       CE        125     DCE     Ring Indicator  
	24         XTC      DA        113     DTE     External        
						      Transmit Clock  
	25         OOS      CN        142     DTE     Terminal Busy  
  
	**Pin 9 need not be present in your RS232C cable  
	***Pins 15 and 17 are necessary only for synchronous operation  
	****Also known as DTR (Data Terminal Ready)  
The computer or terminal should be supplied with a cable terminated 
with a Cinch DB25P (or equivalent) connector mounted in a Cinch DB51226-1 
(or equivalent) hood assembly as specified by the EIA RS232C standard.  

FUNCTIONAL DESCRIPTION OF  RS232C SIGNALS:  
Transmitted Data - Pin 2, SD (BA)  
Direction: to modem  
Signals on this circuit are generated by the customer's terminal and 
transferred to the transmitter of the  MT1432BA. A positive signal is 
a space (binary 0) and a negative signal is a mark (binary 1). The  
transmitting terminal should hold this line in the marking state when no 
data is being transmitted, including intervals between characters or 
words. The TRANSMIT (XMT) LED indicates the status of this circuit.  

Received Data - Pin 3, RD (BB)  
Direction: from modem  
The lead is the data output of the modem. Data signals received from 
the remote modem are presented on this line. When no carrier signal is 
being received (pin 8 negative), this line will be forced into a marking  
condition. The RECEIVE (RCV) LED indicates the status of this signal.   

Request To Send - Pin 4, RTS (CA)  
Direction: to modem  
The RTS signal indicates to the modem that the computer or terminal 
has data that it wants to transmit.  

Clear To Send - Pin 5, CTS (CB)  
Direction: from modem  
The CTS  line indicates to the terminal that the MT1432BA will 
transmit any data present on the Transmit  Data line (pin 2).   

Data Set Ready - Pin 6, DSR (CC)   
Direction: from modem  
DSR On indicates that the MT1432BA is in the data mode and is 
connected to the communications channel. This signal will be on 
during analog-loop-test mode.  

Signal Ground - Pin 7, SG (AB)  
The SG lead is connected to signal ground of the modem. It establishes 
the common ground reference for  all other interface signals.  

Data Carrier Detect - Pin 8, CD (CF)   
Direction: from modem  
DCD On (positive voltage) indicates that data carrier has been received 
from the other modem. This circuit will not normally turn on in the 
presence of message circuit noise or out-of-band signals. There is a one  
second delay between when the carrier tone has been detected and when 
the CD circuit is turned on. This signal goes off if received data 
carrier falls below the receiver threshold for more than 37 mSec. When  
CD is off, the Received Data circuit (pin 3) is held to the marking state.  

Test Voltage - Pin 9, XV  
Direction: from modem  
The XV  lead has 330 ohms of resistance to +12 volts DC. This lead 
may be used to strap other signals  high. For example, if the terminal 
does not supply a DTR (Data Terminal Ready) signal, Pin 9 may be  
jumpered to Pin 20 (DTR) on the RS232 connector or in the cable to 
force DTR on.  

Transmit Clock - Pin 15, TC (DB)  
Direction: from modem  
The TC  signal is provided only when the MT1432BA is used in the 
synchronous mode. The clock is a square wave and is used to provide 
the computer or terminal with timing information for its Transmit Data  
circuit (pin 2). This clock will be provided on the interface at all times 
when the modem is in  synchronous mode.  The first signal element of the 
Transmitted Data signal should be presented by the terminal on the first  
positive (Off to On) transition of TC which occurs after the CTS circuit 
on pin 5 has turned on. The transmitted data is sampled by the modem on 
negative transition of TC.   

Receive Clock - Pin 17, RC (DD)  
Direction: from modem  
The RC signal has the same characteristic of Transmit Clock, with the 
exception that it is used to provide the computer or terminal with timing 
information for its Receive Data (pin 3) circuit. The negative  
transition (On to Off) of RC indicates the center of each signal element 
on the Received Data circuit.  

Data Terminal Ready - Pin 20, TR or DTR (CD)  
Direction: to modem  
This signal (TR or DTR) provides a means for the terminal or computer 
to control the modem's connection to the communications channel. A high 
DTR signal is required by the modem to be able to communicate.  
Turning DTR off for more than 50 mSec will force the modem to 
disconnect. The most common use of DTR is in automatic answer applications. 
A high DTR signal is required by the modem to answer a call. A frequently 
used method is to have the computer turn on DTR in response to RI  
(Ring Indicator), which allows the modem to answer. Later, DTR is 
turned off at the conclusion of the log off procedure, which forces 
the modem to disconnect, enabling it to receive another call. In non 
auto answer applications it is advisable to leave DTR on using the modem's 
DIP-switch option. This is the standard factory setting. An alternative is 
to provide a constant high DTR from the terminal or computer. The Data  
Terminal Ready (DTR) LED indicates the status of this signal.   

Ring Indicator - Pin 22, RI (CE)  
Direction: from modem  
This signal will remain on for the duration of the ringing signal. When a 
ring signal is received by the modem, the modem will automatically answer 
after the first ring. The modem will answer after a specified  
number of rings which can be programmed in AT Command Mode, but 
if none is specified, the modem will  answer after the first ring.  

External Transmit Clock - Pin 24, XTC  
Direction: to modem  
Supplies the same function as transmit clock on Pin 15.  
Terminal Busy (Out of Service) - Pin 25, OOS   
Direction: to modem  
The Terminal Busy (OOS) circuit is not defined in the RS232C 
standard, but is used by us and most manufacturers to make the phone lines 
busy to incoming phone calls. Pin 25 is not normally connected to  
the RS232C interface when shipped from the factory; it can be ordered 
connected as an option. If pin 25 is connected and is brought high, 
the modem will be placed Off Hook, and busy to incoming calls. 

