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Appendix E
AT Command Summary
Command
Values
AT
n/a
RETURN
n/a
A
n/a
A/
n/a
A:
n/a
&An
n = 0 or 1
$An
n = 0 or 1
#An
n = 0–3
Bn
n = 0 or 1
&BSn
n = 0 or 1
$BAn
n = 0 or 1
&Cn
n = 0, 1, 2,
or 4
Description
Attention Code
The attention code precedes all command lines except A/ , A: and escape codes.
RETURN Key
Press the RETURN (ENTER) key to execute most commands.
Force Answer Mode
Answer call immediately without waiting for ring.
Repeat Last Command
Do not precede this command with AT. Do not press RETURN to execute.
Continuous Redial
Continuous redial of last number until answered. (10 redials in North American models.
Not used on International or U.K. models.)
Answerback
*** &A0
Answerback off.
&A1
Answerback on.
Auto-Reliable Buffering
*** $A0
Discard data received during establishment of reliable connection
$A1
Buffer data received during establishment of reliable connection
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.
Answer Tone (International models only)
*** B0
Select ITU-T V.21 answer tone.
B1
Select Bell 103 answer tone.
Maximum Reliable Block Size
&BS0 Maximum transmit block size of 64 characters.
*** &BS1 Maximum transmit block size of 256 characters.
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.)
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.
Appendix
98
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