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contain reference material, and can be skipped. If you
have difficulties getting your modem to work, read
Section 6 - Troubleshooting to find answers to com-
monly 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
Command Mode until you dial a number and establish
a connection. Commands may be sent to your modem
from a PC running communication software or any
other terminal devices.
Your modem is capable of data communication
at rates of: 300, 1200, 2400, 4800, 9600, 14400,
19200, 28800, 38400, 57600, and 115200 bps. Make
sure your COM port baud rate settings in your commu-
nications 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 commands. If you omit a param-
eter 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.
B_ B0 CCITT mode
B1 Bell mode