
Chapter 5 – AT Commands,
AT Commands
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 ENTER |
|
| to execute. |
Command: | Bn | Communication Standard Setting |
Values: |
| n = |
Default: |
| 0 and 15 |
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: | 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 |
|
| 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 selected.)
, 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
@ Wait for quiet answer. Causes modem to wait for a ringback, then 5 seconds of silence, before processing next part of command. If silence is not detected, the modem returns a NO ANSWER code.
^ Disable data calling tone transmission.
$ Detect AT&T call card “bong” tone. The character should follow the phone number and precede the user’s call card number: ATDT1028806127853500$123456789
Command: | DS=y Dial Stored Telephone Number |
Values: | n = |
Default: | none |
Description: | Dial a number previously stored in directory number y by the &Zy=x command. Example: |
| ATDS=2 |
SocketModem Global MT5634SMI Developer’s Guide | 25 |