VIKING COMPONENTS 56K USB MODEM USER’S GUIDE
7 Basic AT Commands
From terminal mode or command line,AT commands allow you to control your
modem. If you are using your communications software to operate your modem,
the software menus configure the AT commands. Follow the instructions in this
chapter to operate your modem directly from the terminal mode.

Guidelines

“AT”precedes most commands. Enter the AT commands exactly as they appear in
the following Command column. The commands can be typed in either upper or
lower case letters,but cases should not be mixed. There can be up to a total of 40
characters in one command and spaces are not necessary. To activate a complete
command string,press the “Enter”key.

Basic AT Command Set

Command Function
A/ Re-execute command.
A Go off-hook and attempt to answer a call.
B0 Select V.22 connection at 1200 bps.
B1 Select Bell 212A connection at 1200 bps.
C1 Return OK message.
Dn Dial modifier.
E0 Turn off command echo.
E1 Turn on command echo.
H0 Initiate a hang-up sequence.
H1 If on-hook,go off-hook and enter command mode.
I0 Report product code.
I1 Report pre-computed.
I2 Report OK.
Chapter 7
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