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7
3.3 Basic AT Commands
In the following listings, all default settings are
printed in bold text.
Command Function
A Manually answer incoming call
A/ Repeat last command executed. Do not
precede A/ with AT or follow with ENTER
AT Appears at the beginning of every
command line
B_ B0 CCITT mode
B1 Bell mode
B2 V.23 at 1200/75
B3 V.23 at 75/1200
C_ C0 Carrier always off
C1 Normal transmit carrier
D_ 0 - 9, A-D, # and *
P pulse dialing
R originate calls in answer mode
T touch-tone dialing
W wait for second dial tone
, pause
@ wait for five seconds of silence
! flash
; return to Command Mode after dialing
DS=n Dial one of the four telephone numbers
(n=0-3) stored in the modem’s non-
volatile memory
E_ E0 Commands are not echoed
E1 Commands are echoed
F_ F0 Enables online echo
F1 Disables online echo
+++ TIES Escape Characters - Switch from
Data Mode to Command Mode
H_ H0 Force modem on-hook (hang up)
H1 Force modem off-hook (make busy)
I_ I0 Display product-identification code
I1 Factory ROM ID
I2 Internal memory test
I3 Device ID
I4 Reserved