A/ Re-executes the last issued command. Used mainly to redial.
A Go off-hook and attempt to answer a call.
AT? Read Selected S-Register. This command reads and displays the
selected S-Register. An S-Register can be selected by using the
ATSn command.
Bn Bell/ITU-T answer sequence.
B0 Select V.22 connection at 1200bps.
B1 Select Bell 212A connection at 1200bps.
Cn Carrier Control.
C1 return OK message.
Dn Dial.
0-9 DTMF digits 0 to 9.
* The 'Star' digit (tone dialing only).
# The 'gate' digit (tone dialing only).
A-D DTMF digits A,B,C, and D. Some countries may prohibit sending of
these digits during dialing.
L Re-dial last number: the modem will re-dial the last valid
telephone number. The L must be immediately after the D with all
the following characters ignored.
P Pulse (rotary) dial.
T Tone dial.
R This command will be accepted, but not acted on.
S=n Dial the number stored in the directory (n=0 to 3). (See &Z.)
! Flashes the switch hook.
W Wait for second dial tone (X3 or higher); linked to S6 register.
@ Dials, waits for quiet answer, and continues (X3 or higher).
, Dial pause: the modem will pause for a time specified by S8 before
dialing the digits following ",".
; Return to command mode after dialing.
^ Toggles calling tone enable/disable.
En Command Echo
E0 disables command echo.
E1 Enables command echo.
Hn Disconnect (Hang-up)
H0 Hang up. (goes on-hook)
H1 Goes off-hook.
In Identification
I0 Reports product code.
I1 Reports modem chip firmware version
I2 Verifies ROM checksum.
I3 Reports chipset name.
I4 Reserved.
I6 Country code.
I23 Reports OEM defined identifier string
Ln Speaker Volume.
L0 Low speaker volume
L1 Set low speaker volume.
L2 Set medium volume.
L3 Set high volume.
Mn Speaker Control.
M0 Speaker always off.
M1 Speaker ON until CONNECT.
M2 Speaker always on.
M3 Speaker off during dialing and receiving carrier and turn speaker
on during answering.
Nn Automode Enable.
N0 Turn off automode detection.
N1 Turn on automode detection.
On Return to On-Line Data Mode.
O0 Go on-line.
O1 Go on-line and retrain.
P Set Pulse Dial.(for phone lines that don't support touch-tone
dialing)