MultiModemDSVD User Guide

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AT Commands, S-Registers, and Result Codes

Command:

$SBn Serial Port Baud Rate

Values:

 

n = speed in bits per second

Default:

57600

Description: $SB300

 

Set serial port to 300 bps.

 

$SB1200

 

Set serial port to 1200 bps.

 

$SB2400

 

Set serial port to 2400 bps.

 

$SB4800

 

Set serial port to 4800 bps.

 

$SB9600

 

Set serial port to 9600 bps.

 

$SB19200

 

Set serial port to 19200 bps.

 

$SB38400

 

Set serial port to 38400 bps.

 

$SB57600

 

Set serial port to 57600 bps.

 

$SB115200

Set serial port to 115200 bps.

 

$SB230400

Set serial port to 230400 bps.

 

 

 

 

 

Note: See also the L5 command.

 

 

 

Command: +++AT<CR>

Escape Sequence

Values:

n/a

 

Description:

 

Puts the modem in command mode (and optionally issues a

 

 

command) while remaining online. Type +++AT and up to ten

command characters, then press ENTER. Used mostly to issue the hang-up command: +++ATH<CR>.

Voice Commands

The MultiModemDSVD uses DSVD technology to achieve simultaneous voice and data operation over a telephone line. Establishing a DSVD connection is like establishing a regular data modem connection. Initiate the call to another DSVD modem using normal dialing (ATD) and answering (ATA) procedures. The modem can switch from a regular phone conversation into DSVD mode and back to phone con- versation. A headset or microphone/speaker can be used for voice communication during DSVD mode.

Command: -SMS=nData/DSVD Mode

Values:

n = 0, 1, or 3

Default:

3

Description: -SMS=0 Data mode. -SMS=1 DSVD mode.

-SMS=3 Automatic mode select (data/DSVD)

Note: DSVD mode can be enabled by either the -SSE=1or the -SMS=1command, and disabled by either -SSE=0or -SMS=0.

Multi-Tech Systems, Inc.

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