Multi-Tech Systems MT2834BL - Manual (Page 109)

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Appendix D - V.25bis Operation
Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide
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).
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
115200 = 115200 bps