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AT Commands
AT commands, which are issued from an asynchronous DTE
such as a computer, control the modem’s operation and software
configuration. The following is a list of the basic assumptions
made with AT commands.
Basic Assumptions
• AT commands can be typed in uppercase,
lowercase, or mixed.
• Most AT commands are preceded by the “AT”
prefix. Commands such as “A/” and “+++”, which
do not begin with AT, are so specified.
• AT commands are entered by pressing the character
specified in S-Register S3. The default is a Carriage
Return (CR). The maximum command length is 62
characters including CR/LF.
• AT commands that have a zero parameter can be
entered without the zero (e.g., ATE0=ATE), except
when the numeric value relates to a value used in
the command.
• More than one command can be placed on the same
command line. However, some commands must be
at the beginning or end of the command line. Such
commands are so specified.
• Multiple commands on a command line do not
require an “AT” preceding each command. One
“AT” at the beginning of the command line is
sufficient.
• Default settings are indicated by an asterisk (*).
• All commands and parameters not listed in this
specification should result in “ERROR.”
+++
A/
A
AT
Bn
B0
B1
B2
B3
B15
B16*
Dn
,
$
!
@
s=n
^
;
L
P
T*
V
W
En
E0
AT Commands
Basic AT Commands
Escape - Exits from data mode to command mode while on-line.
Repeat Last Command - Re-executes last command string. (Not to be preceded
with AT or followed by pressing the Return key.)
Answer Command - Instructs the modem to go off-hook and answer an
incoming call. Pressing any key aborts the operation.
Attention Command - Required prefix for all commands unless otherwise
noted. Use alone to test for OK result code.
Communication standard setting - determines CCITT vs. Bell standard.
Selects CCITT V.22 mode when the modem is at 1200 BPS.
Selects Bell 212A when the modem is at 1200.
Deselects V.23 reverse channel (same as B3).
Deselects V.23 reverse channel (same as B2).
Selects V.21 when the modem is at 300 BPS.
Selects Bell 103J when the modem is at 300 BPS.
Begins the dialing sequence. The string n (modifiers and telephone number)
is entered after the D command.
Pause for duration specified in S-Register 8.
Calling card “bong” detect.
Hook flash. Causes the modem to go on-hook for 0.5 seconds and then return
to off-hook.
Wait for 5 seconds of silence after dialing the number. If silence is not detected,
the modem sends a NO ANSWER result code back to the user.
Dial a telephone number previously stored (see the &Zn=x command). The
range of n is 0-1.
Disable data calling tone transmission.
Return to command mode after dialing the number, without disconnecting
the call.
Redial the last dialed number.
Pulse dial.
Touch-tone dial.
Switch to speaker phone and dial the number. An ATH command may be
used to disconnect the voice call.
Wait for second dial tone.
Off-Line Echo Command - Determines whether characters are echoed to the
DTE.
Local Character echo OFF.
Function
Command
Modifier