Chapter 4 - AT Commands,
AT Command Summary
Command: AT | Attention Code |
Values: | n/a |
Description: | The attention code precedes all command lines except A/, A:, and escape sequences. |
Command: ENTER Key | |
Values: | n/a |
Description: | Press the ENTER (RETURN) key to execute most commands. |
Command: A | Answer |
Values: | n/a |
Description: | Answer call before final ring. |
Command: A/ | Repeat Last Command |
Values: | n/a |
Description: | Repeat the last command string. Do not precede this command with AT. Do not press EN- |
| TER to execute. |
Command: Bn | Communication Standard Setting |
Values: | n = |
Default: | 1 and 16 |
Description:B0 | Select |
B1 | Select Bell 212A when modem is at 1200 bps. |
B2 | Deselect V.23 reverse channel (same as B3). |
B3 | Deselect V.23 reverse channel (same as B2). |
B15 | Select V.21 when the modem is at 300 bps. |
B16 | Select Bell 103J when the modem is at 300 bps. |
Command: Cn | Carrier Control |
Values: | n = 1 |
Default: | 1 |
Description:C0 | Transmit carrier always off. (Not supported.) |
C1 | Normal transmit carrier switching (included for backward compatibility with some software). |
Command: Ds | Dial |
Values: | s = dial string (phone number and dial modifiers) |
Default: | none |
Description: | Dial telephone number s, where s may up to 40 characters long and include the |
| A, B, C, and D characters, and the L, P, T, V, W, S, comma (,), semicolon (;), !, @, ^ and $ |
| dial string modifiers. |
Dial string modifiers:
LRedial last number. (Must be placed immediately after ATD.) P
T
V Switch to speakerphone mode and dial the following number. Use ATH command to hang up.
W Wait for a new dial tone before continuing to dial. (X2, X4, X5, X6, or X7 must be se- lected.)
, Pause during dialing for time set in register S8.
; Return to command mode after dialing. (Place at end of dial string.)
! Hook flash. Causes the modem to go
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