Appendix

Appendix E

AT Command Summary

Command

Values

Description

AT

n/a

Attention Code

 

 

The attention code precedes all command lines except A/, A: and escape codes.

RETURN

n/a

RETURN Key

 

 

Press the RETURN (ENTER) key to execute most commands.

A

n/a

Force Answer Mode

 

 

Answer call immediately without waiting for ring.

A/

n/a

Repeat Last Command

 

 

Do not precede this command with AT. Do not press RETURN to execute.

A:

n/a

Continuous Redial

 

 

Continuous redial of last number until answered. (10 redials in North American models.

 

 

Not used on International or U.K. models.)

&An

n = 0 or 1

Answerback

 

***

&A0

Answerback off.

 

 

&A1

Answerback on.

$An

n = 0 or 1

Auto-Reliable Buffering

 

***

$A0

Discard data received during establishment of reliable connection

 

 

$A1

Buffer data received during establishment of reliable connection

#An

n = 0–3

Auto Speed Detection in Answer Mode

 

***

#A0

Start at maximum speed and fall back to 14400 to 12000 to 9600 to 4800 to

 

 

 

2400 to 1200 to 300 bps.

 

 

#A1

Maximum speed only.

 

 

#A2

Start at maximum speed and fall back incrementally to 4800 bps only.

 

 

#A3

Start at 2400 bps and fall back to 1200 to 300 bps only.

Bn

n = 0 or 1

Answer Tone (International models only)

 

***

B0

Select ITU-T V.21 answer tone.

 

 

B1

Select Bell 103 answer tone.

&BSn

n = 0 or 1

Maximum Reliable Block Size

 

 

&BS0

Maximum transmit block size of 64 characters.

 

***

&BS1

Maximum transmit block size of 256 characters.

$BAn

n = 0 or 1

Baud Adjust

 

***

$BA0

Set baud adjust off, speed conversion on. (Serial port speed is independent of

 

 

 

modem data rate.)

 

 

$BA1

Set baud adjust on, speed conversion off. (Serial port speed is same as

 

 

 

modem data rate.)

&Cn

n = 0, 1, 2,

 

or 4

Carrier Detect Control

&C0

Force Carrier Detect on.

*** &C1

Let Carrier Detect follow carrier signal.

&C2

Let Carrier Detect drop for time set by S24 on disconnect, then go high again.

&C4

Reset modem when Carrier Detect drops.

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Multi-Tech Systems MT2834MR6 manual Appendix E, AT Command Summary, Command Values Description