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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
A Manually 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