Modem User's Manual

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, and

57600 bps. Make sure your COM port baud rate setting 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

AT Appears at the beginning of every command

line

B_ B0 CCITT mode

B1 Bell mode

D_ 0 - 9, A-D, # and *

P pulse dialing

R originate calls in answer mode