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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 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 commands. 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.
B_ B0 CCITT mode
B1 Bell mode
D_ 0 - 9, A-D, # and *
L last number redial
P pulse dialing
T touch-tone dialing
W wait for second dial tone