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Command:
$MBn Modem Baud Rate
Values:
75, 300, 1200, 2400, 4800, 9600, 14400, 19200, 28800, 33600
Default:
33600
Description:
Presets the transmission baud rate for originate operations (i.e., the speed of the modem's
transmissions over the telephone lines when originating a call). With speed conversion,
transmission speed can be a different baud rate than the serial port speed.
When the modem receives a call from another modem, it automatically switches its phone
line transmission speed to match the calling mode. However, if the MultiModem originates a
call to another modem that is unable to connect at the MultiModem's baud rate, it
automatically drops to the lower baud rate in an attempt to match that modem's speed. For
example, if the MultiModem is set for 19200 baud and calls a modem with a top speed of
2400 baud, it drops to 2400 baud.
AT$MB75
AT$MB300
AT$MB1200
AT$MB2400
AT$MB4800
AT$MB9600
AT$MB14400 =
AT$MB19200 =
AT$MB28800 =
AT$MB33600 =
Command:
$RP
Response Priority
Values:
n = 0, 1
Default:
1
Description:
Configures whether an incoming ring or an AT command will have priority.
$RP0 - AT command will have priority
$RP1 - Incoming call (ring) will have priority
Command:
$SBn Serial Port Baud Rate
Values:
n = speed in bits per second
Default:
57600
Description:
$SB300
$SB1200
$SB2400
$SB4800
$SB9600
$SB19200
$SB38400
$SB57600
$SB115200
$SB230400
Multi-Tech Systems, Inc. AT Commands Reference Guide (PN S000272E)
=
V.23
=
300 bps
=
1200 bps
=
2400 bps
=
4800 bps
=
9600 bps
14400 bps
19200 bps
28800 bps
33600 bps
Set serial port to 300 bps.
Set serial port to 1200 bps.
Set serial port to 2400 bps.
Set serial port to 4800 bps.
Set serial port to 9600 bps.
Set serial port to 19200 bps.
Set serial port to 38400 bps.
Set serial port to 57600 bps.
Set serial port to 115200 bps.
Set serial port to 230400 bps. (V.92 models only)
Chapter 1 – AT Commands
17
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