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Chapter 3 – AT Commands, S-Registers, and Results Codes
Multi-Tech Systems, Inc. MT2834ZDX User's Guide 8
Chapter 3 – AT Commands, S-Registers
and Result Codes
AT Commands
This section summarizes the AT commands for this modem.
Command: AT Attention Code
Values: n/a
Description: The attention code precedes all command lines except A/, A:, and escape codes.
Command: RETURN Key
Values: n/a
Description: Press the RETURN (ENTER) key to execute most commands.
Command: A Force Answer Mode
Values: n/a
Description: Answer call before final ring.
Command: A/ Repeat Last Command
Values: n/a
Description: Do not precede this command with AT. Do not press RETURN to execute.
Command: A: Continuous Redial
Values: n/a
Description: Redial last number until answered (10 redials in DOC modems). Do not precede this command with
AT or press RETURN to execute.
Command: &An Answerback
Values: n = 0 or 1
Default: 0
Description: &A0 Disables answerback.
&A1 Enables answerback reply to an ID request.
Command: $An Auto-Reliable Buffering
Values: n = 0 or 1
Default: 0
Description: $A0 Discard data received during establishment of a reliable connection.
$A1 Buffer data received during establishment of a reliable connection.
Command: #An Auto Speed Detection in Answer Mode
Values: n = 0–3
Default: 0
Description: #A0 Start at maximum speed and fall back to a lower speed (26400, 24000, 21600, 19200, 16800,
14400, 12000, 9600, 7200, 4800, 2400, 1200, or 300 bps) as line conditions warrant.
#A1 Maximum speed only.
#A2 Start at maximum speed and fall back decrementally to 4800 bps only.
#A3 Start at 2400 bps and fall back to 1200 to 300 bps only.
Command: &BSn Maximum Reliable Block Size
Values: n = 0 or 1
Default: 1
Description: &BS0 Maximum transmit block size of 64 characters.
&BS1 Maximum transmit block size of 256 characters.