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Host-Based Controller Modem Data Addendum
AT Command Set June 15,
1998
2 Version 1.0 Lucent Technologies Inc.
AT Command Summary
The following tables summarize the commands implemented by the modem. Commands may be executed when
the modem is in COMMAND mode. COMMAND mode is entered upon under one of the following conditions:
✟ After power up
✟ At the termination of a connection
✟ After the execution of a command other than dial or answer commands (ATO or AT&T)
✟ Upon the receipt of the ESCAPE SEQUENCE (three consecutive characters matching the contents of
S register 2) while on-line mode
✟ Upon the on-to-off transition of DTR if &D1, &D2, or &D3 has been set
Table 1. AT Command Set Summary
Command Description Command Description
A/ Repeat last command &J Auxiliary relay options
A Answer command &K Local flow control selection
B Communication standard setting &M Asynchronous communications mode
C Carrier control &Q Asynchronous communications mode
D Dial command &S Data set ready (DSR) option
E Echo command &T Self-test commands
F On-line data character echo command &V View the active configuration
H Hook control &W Store current configuration
I Request ID information &Y Select stored profile for hard reset
L Monitor speaker volume &Z Store telephone number
M Monitor speaker mode \A MNP block size
N Modulation handshake \B Send break
O Return to on-line data mode \G Modem port flow control
P Select pulse dialing \J Adjust bits/s rate control
Q Result code control \K Set break control
T Select tone dialing \N Error control mode selection
V DCE response format \Q Local flow control selection
W Result code option \R Ring indicator off after answer
X Result code selection and call progress
monitoring
\T Inactivity timer
Y Long-space disconnect \V Protocol result code
Z Reset and recall stored profile \X XON/XOFF pass through
&B V.32 auto retrain %B View numbers in blacklist
&C Data carrier detect (DCD) control %C Data compression control
&D Data terminal ready (DTR) %E Automatic rate change
&F Local factory settings -C Data calling tone
&G V.22bis guard tone control -V90 Enable/disable V.90 settings