Chapter 2 – AT Commands
Command: | Qn Result Codes Enable/Disable | |
Values: | n = 0 or 1 | |
Default: | 0 |
|
Description: | Q0 | Enables result codes. |
| Q1 | Disables result codes |
Command: | Sr | Select Register |
Values: |
| r is the |
Default: |
| None |
Description: |
| Selects register Sr as the last register accessed; e.g., S0. The command AT? can then be |
|
| used to read the register, and the command AT=n can then be used to set the register to |
|
| value n. |
Command: | Sr=n Set Register Value |
Values: | r is the |
Default: | None |
Description: | Sets value of register Sr to n, where n is entered in decimal format; e.g., S0=1. |
| If the short form AT=n is used, the value is written to the last accessed |
Command: | Sr? Read Register Value |
Values: | r is the |
Default: | None |
Description: | Reads value of register Sr and displays it in |
| response 043. If the short form AT? is used, the last accessed |
Command: | T | Tone Dialing |
Values: |
| P,T |
Default: |
| T |
Description: |
| Forces DTMF |
Command: | Vn Result Code Format | |
Values: | n = 0 or 1 | |
Default: | 1 |
|
Description: | V0 | Displays result codes as digits (terse response). |
| V1 | Displays result codes as words (verbose response) |
Command: | Wn Connect Message Control | |
Values: | n = 0, 1, or2 | |
Default: | 0 |
|
Description: | W0 | The CONNECT result code reports the serial port speed only. |
| W1 | The CONNECT result code reports the line speed, the error correction protocol, |
|
| and the serial port speed, respectively. |
| W2 | The CONNECT result code reports the line speed only. |
| Note: See also the \V command |
Command: | Xn Result Code Selection | |
Values: | n = | |
Default: | Country Dependent | |
Description: | Selects the result message subset that the modem will use to inform the computer of the | |
| results of commands. | |
| X0 | Sends OK, CONNECT, RING, NO CARRIER, ERROR and NO ANSWER; does not |
|
| look for dial tone or busy signal. |
| X1 | Sends X0 messages and connect speed; doesn’t look for dial tone or busy signal. |
| X2 | Sends X1 messages with NO DIALTONE; does not look for busy signal. |
| X3 | Sends X1 messages with BUSY; does not look for dial tone. |
| X4 | Sends all messages, including NO DIALTONE and BUSY. |
| Note: In fax mode, the only message sent to indicate a connection is CONNECT without | |
|
| a speed indication. See also the \V command. |
7 |