C-2 Modem Commands, Registers, and Codes
AT COMMANDS
COMMAND
DESCRIPTION
A
Manual answer.
A/
Repeat last command (No AT needed).
AT
Attention code; precede all commands except A/
and +++
B, B0
CCITT V.22 mode at 1200 bps; V.21 at 300 bps.
B1
Bell 212 A mode at 1200 bps; Bell 103 at 300
bps.
D
Modifiers:
Dial the number that follows D in the command
line. For example, ATDP555-1234 commands
the modem to pulse dial the phone number
555-1234.
0 to 9 Dialing digits.
A,B,C,D,*,# Tone dial characters.
P Pulse dial.
R Reverse originate mode.
S=
n Dials the telephone number n
(0-3) stored with the &Zn=x
command.
T Tone dial.
W Wait for dial tone. (Time specified
in register S6)
, Pause. (Time specified in register
S8)
! Flash hook.
@ Wait for quiet answer. (Time
specified in register S6)
; Return to command mode.
L Dial last number.
E, E0
Disable modem echo to terminal in command
mode.
E1
Enable modem echo to terminal in command
mode.
H, H0
Go on-hook (hang up).
H1
Go off-hook.
