U-90E
Data/Fax
Modem
AT Command Set Summary
5-1
Chapter 5
AT Command Set Summary
An
AT
command is a command issued by the computer/terminal to the modem through
the asynchronous computer-modem interface in asynchronous data format.
AT
commands control the modem’s behavior and actions. To send an
AT
command from a
computer to the modem, you must be running a communication software and the modem
must be in command state.
An
AT
command prefix (Attention) precedes each command line, except in the case of
A/
,
A>
and
+++
as mentioned earlier (see Table 3-3). Up to 40 commands can be entered
in a command line with a single
AT
prefix. Be sure to either use all capital letters (
AT
) or
all small letters (
at
).
5.1 Basic
AT
Command
Set
A list of the basic
AT
commands follows. Each command should be entered after an
AT
prefix. A* sign indicates that it is a default setting.
Table 5-1 Basic AT Command Set
Command Options
Function & Description
Ref.
A
Go on-line in answer mode. (See also
S39.2, S43.6)
Bn
Handshake
option.
S28.7
B0 *
Select CCITT V.22 for 1200 bps
B1
Select Bell 212A for 1200 bps
communication.
D
s
Dial s (numbers and options) that follow
(see also S38.0, S35.4). The options of s
