32
MINI-MODEM V.92
You must press ENTER to send the command to the modem. Any time the modem
receives a command, it sends a response known as a result code. The most
common result codes are OK, ERROR, and the CONNECT messages that the
modem sends to the computer when it is connecting to another modem. For
a table of valid result codes, see Section 5.3.
You can issue several commands in one line, in what is called a command string.
The command string begins with AT and ends when you press ENTER. Spaces
to separate the commands are optional; they are ignored by the command
interpreter. The most-familiar command string is the initialization string, which
is used to configure the modem when it is turned on or reset, or when your
communications software calls another modem.
5.1 AT Commands
Command:
AT
Attention Code
Values: n/a
Description:
The attention code precedes all command lines
except A/ and the escape sequence.
Command:
ENTER Key
Values: n/a
Description: Press
the
ENTER
or RETURN key to execute most
commands.
Command:
A Answer
Values: n/a
Description:
Answers an incoming call before the final ring.
Command:
A/
Repeat Last Command
Values: n/a
Description:
Repeats the last command string. Do not precede
this command with AT. Do not press ENTER to
execute.
Command:
Bn
Communication Standard Setting
Values:
n = 0–3, 15, 16
Default:
1 and 16
Description:
B0
Select ITU-T V.22 mode when modem is at 1200 bps.
B1
Select Bell 212A when modem is at 1200 bps.
B2
Deselect V.23 reverse channel (same as B3).
B3
Deselect V.23 reverse channel (same as B2).
B15
Select V.21 when the modem is at 300 bps.
