Multi-Tech Systems MT2834MR6 - Manual (Page 77)

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Chapter 5 - Error Correction, Data Compression, and Speed Conversion
5.12.3 Serial Port Baud Rate ($SB)
The $SB command presets the speed of the MT2834MR6’s RS-232 serial port in both the originate and the
answer modes. Speed conversion allows you to set this serial port baud rate at a fixed speed of up to
115,200 bps, regardless of the modem’s transmission speed setting.It also sets the default speed at which
the modem issues command responses (result codes).
For this command to work, the modem’s baud adjust feature must be turned off with the $BA command.
The MT2834MR6 will accept AT commands at any speed, regardless of the speed preset by the $SB
command. If the modem receives such a command at a speed that is different from the preset speed, the
modem switches its serial port baud rate to match the new AT command speed, although the baud rate value
stored by the $SB command remains the same. This provides you with a convenient way to switch the serial
port speed, while still making it easy to automatically return to the original speed the next time the modem is
powered up, or reset using the ATZ command.
To set the serial port baud rate, type AT$SBn, where n can be 300, 1200, 2400, 4800, 9600,19,200, 38,400,
57,600, or 115,200 bps as listed below:
AT$SB300 300 bps AT$SB1200 1200 bps
AT$SB2400 2400 bps AT$SB4800 4800 bps
AT$SB9600 9600 bps AT$SB19200 19200 bps
AT$SB38400 38400 bps AT$SB57600 57,600 bps
AT$SB115200 115,200 bps (factory default)