User`s manual

AT Command Set

There may be times when you need to access the modem manually with AT com-

mands. These commands may be sent to your modem from a PC running commu-

nications software such as Hyper Terminal.

Command Format

All commands must begin with the AT prefix, followed by the parameter and

ending with the ENTER key. All commands may be typed in either upper or

lower case, but not mixed. A command without any parameters will be consid-

ered as specifying the same command with a parameter of “0”. The maximum

command length is eight (8) characters. The modem does not count the AT prefix,

carriage returns, or spaces.

Example: ATH [ENTER]

This command causes your modem to hang up.

Basic AT Commands

In the following listings, all default settings are printed in bold text.

Command Function

A/ Repeat last command. Do not precede A/ with

AT or follow with ENTER

A Answer

D Dial command

P Select pulse dialing; affects current and subsequent dialing

T Select tone dialing; affects current and subsequent dialing

En Command echo

E0 Disables echo

E1 Enables echo (default)

Hn Switch hook Control

H0 Hangs up the telephone line (default)

H1 Picks up the telephone line

Ln Speaker volume

L0 Off or low speaker volume

L1 Low volume

L2 Medium volume (default)

L3 High volume