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APPENDIX G: V.25bis Operation
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 synchro-
nization.
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