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| Appendix C - AT Command Summary |
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Apendix C - AT Command Summary | ||
Command | Values | Description |
AT |
| Attention Code that precedes most command strings |
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| except A/, A: and Escape Codes. |
RETURN |
| Pressing RETURN key executes most commands. |
$ |
| This symbol placed in dialing string enables the |
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| modem to detect AT&T's "call card" tones for |
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| accessing user's calling card to originate an |
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| connection. |
A |
| Answer call, even if no ring present. Repeat last |
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| command. (Do not precede this command with AT. |
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| Do not hit RETURN to execute.) |
A: |
| Continuous redial (10 redials in DOC units) of last |
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| number until answered. (Not used Internationally.) |
$An | n = 0 or 1 | * $A0 discards data during |
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| $A1 buffers data during |
#An | n = 0 thru 3 | * #A0 selects initial handshake at:33,600 to 31,200 to |
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| 28,800 to 24000 to 21,600 to 19,200 to 16,800 to |
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| 14,400 to 12,000 to 9600 to 4800 to 2400 to 1200 to |
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| 300 bps. |
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| #A1 selects initial handshake at 33,600 bps only. |
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| #A2 selects initial handshake at 33,600 to 31,200 to |
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| 28,800 to 24000 to 21600 to 19,200 to 16,800 |
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| 19,200 to 14,400 to 9600 to 4800 bps. |
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| #A3 selects initial handshake at 2400 to 1200 to 300 |
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| bps. |
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| * Factory Default Setting |
Bn | n = 0 or 1 | * B0 selects V.21 answer tone. |
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| B1 selects Bell answer tone. |
&Bn | n = 0 or 1 | * &B0 means normal transmit buffer size. |
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| &B1 means reduced transmit buffer size. |
&BSn | n = 0 or 1 | &BS0 means maximum transmit block size of 64 |
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| characters. |
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| * &BS1 means maximum transmit block size of 256 |
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| characters. |
$BAn | n = 0 or 1 | * $BA0 means speed conversion is on. |
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| $BA1 means speed conversion is off. |
&Cn | n = 0,1,2,4 | &C0 forces Carrier Detect on. |
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| * &C1 lets Carrier Detect act normally. |
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| &C2 lets Carrier Detect drop S24 time on |
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| disconnect. |
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| &C4 resets modem when Carrier Detect drops. |
&CDn | n = 0 or 1 | * &CD0 execute cleardown on disconnect. |
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| &CD1 do not execute cleardown on disconnect. |
Ds | s = phone # | Dial a telephone number “s,” where s may include |
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| up to 60 digits or T, P, R, comma and ; characters. |
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