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AT Commands
Command
Function
M3
The speaker is on until the carrier
is detected, except while dialing
N0
Connect only at DTE rate
N1
Automatic rate negotiation
O0
Return to data mode
O1
Retain before returning to online
data mode
O3
Rate renegotiation before returning
to online data mode
P
Selects pulse dialing
Q0
Enables modem to send result
codes to the computer (default)
Q1
Disables modem from sending
result to the computer
T
Selects tone dialing
V0
Displays result codes as digits
V1
Displays result codes as text
(default)
W0
CONNECT result code reports
DTE speed. Disable protocol
result codes.
W1
CONNECT result code reports
DTE speed. Enable protocol
result codes.
W2
CONNECT result code reports
DCE speed. Enable protocol
result codes.
X0
Hayes Smartmodem 300
compatible responses/blind dialing
X1
Same as X0 plus all connect
responses/blind dialing
X2
Same as X1 plus dial tone
detection
12
Command
Function
X3
Same as X1 plus busy signal
detection/blind dialing
X4
All responses and dial tone and
busy signal detection (default)
X5
Same as X4
X6
Same as X4
X7
Same as X0 plus dial tone and
busy signal detection
Y0
Disable long space disconnect
(default)
Y1
Enable long space disconnect
Z0
Reset and recall user profile 0
Z1
Reset and recall user profile 1
&B0
Disable V.32 auto retrain (not
supported)
&B1
Enable V.32 auto retrain (default)
&C0
DCD circuit is always on
&C1
Turn on CD when remote carrier is
present
&D0
DTR signal ignored
&D1
Modem returns to command mode
after DTR toggle
&D2
Modem hangs up and returns to
the command mode after DTR
toggle
&D3
Modem resets after DTR toggle
&F0
Load factory default configuration
&G0
Load factory default configuration
&G1
Sets guard tone to 550 Hz
&G2
Sets guard tone to 1800 Hz
&J0
The auxiliary relay is never closed
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