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Basic AT Commands
Command
Function
A
Answer incoming call
A/
Repeat last command
B0
CCITT mode @1200 bps
B1
Bell mode @ 300/1200 bps
B2
Unselects V23 reverse channel
B3
Unselects V23 reverse channel
B15
CCITT @300 bps
B16
Bell mode @300 bps
C0
Transmit carrier always off
C1
Normal transmit carrier switching
D
0-9, A-D, * and #
DL
Redials last number
DP
Pause dialing
DT
Touch-tone dialing (default)
D,
Pause during dialing
DW
Wait for dial tone
DV
Modem switches to speakerphone
mode
D@
Wait for quiet answer
D!
Hook flash
D;
Return to command mode
D^
Disable data calling tone
transmission
DS=n
Dial one of the four stored phone
numbers (n=0-3) in the modem's
non-volatile memory
AT Commands
Command
Function
D$
Bong tone detection
E0
Disables echo to the computer
E1
Enables echo to the computer
(default)
H0
Modem goes on-hook (default)
H1
Modem goes off-hook
I0
Returns default speed and
controller firmware version
I1
Calculates ROM checksum and
displays it on the DTE
I2
Performs a ROM check and
calculates and verifies the
checksum diplaying OK or
ERROR
I3
Returns the default speed and the
controller firmware version
I4
Returns firmware version for data
pump
I9
Returns country code
L0
Selects low volume
L1
Selects low volume
L2
Selects medium volume (default)
L3
Selects high volume
M0
The speaker is off
M1
The speaker is on until the modem
detects the carrier signal (default)
M2
The speaker is always on when
modem is off-hook
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