commonly asked questions and problems.
Section Three - AT Command Set
3.1 Executing Commands
Commands are accepted by the modem while it is in Command Mode. Your modem is automatically in Com- mand Mode until you dial a number and establish a connec- tion. Commands may be sent to your modem from a PC running communication software or any other terminal de- vices.
Your modem is capable of data communication at rates of: 300, 1200, 2400, 4800, 9600, 14400, 19200, 38400, 57600, and 115200 bps. Make sure your COM port baud rate settings in your communications software is set to one of the above speeds.
3.2 Command Structure
All commands sent to the modem must begin with AT and end with ENTER. All commands may be typed in either upper or lower case, but not mixed. To make the command line more readable, spaces may be inserted between com- mands. If you omit a parameter from a command that requires one, it is just like specifying a parameter of 0. Example:
ATH [ENTER]
This command causes your modem to hang up.
3.3 Basic AT Commands
In the following listings, all default settings are printed
in bold text.
Command Function
AManually answer incoming call.
A/ | Repeat last command executed. Do not precede A/ |
| with AT or follow with ENTER. |
B0 | CCITT mode |
B1 | Bell mode |
B2 | Autoscan mode |
B3 | CCITT V.23 mode only |
B4 | 300 bps connection only |
B5 | 1200 bps connection only |
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