Lenovo ThinkPad i Series 1157 ThinkPad 570 On-line User's Guide - Page 128

Extended AT commands, Keeps DSR on.

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Command X1 X2 X3 X4 Z Extended AT commands Command &C0 &C1 &D0 &D1 &D2 &D3 &F &G0 &G1 &G2 &M0 &S0 Function Runs X0 and further specifies all CONNECT responses and blind dialing. Runs X1 and further specifies dial tone detection. Runs X1 and further specifies busy signal detection and blind dialing. Specifies all responses and dial tone and busy signal detection. (default) Resets and recalls the user profile. Function Specifies that carrier detect (CD) is always on. Turns on CD when the remote carrier is present. (default) Ignores DTR signal. Returns modem to command mode after DTR toggle. Hangs up modem and returns to command mode after DTR toggle. (default) Resets modem after DTR toggle. Loads factory default configuration. Disables guard tone. (default) Enables 550-Hz guard tone. Enables 1800-Hz guard tone. Specifies asynchronous operation. Keeps DSR on. (default) 122 IBM ThinkPad 570 Online Book

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Command
Function
X1
Runs X0 and further specifies all CONNECT
responses and blind dialing.
X2
Runs X1 and further specifies dial tone
detection.
X3
Runs X1 and further specifies busy signal
detection and blind dialing.
X4
Specifies all responses and dial tone and busy
signal detection.
(
default
)
Z
Resets and recalls the user profile.
Extended AT commands
Command
Function
&C0
Specifies that carrier detect (CD) is always on.
&C1
Turns on CD when the remote carrier is
present. (
default
)
&D0
Ignores DTR signal.
&D1
Returns modem to command mode after DTR
toggle.
&D2
Hangs up modem and returns to command
mode after DTR toggle.
(
default
)
&D3
Resets modem after DTR toggle.
&F
Loads factory default configuration.
&G0
Disables guard tone.
(
default
)
&G1
Enables 550-Hz guard tone.
&G2
Enables 1800-Hz guard tone.
&M0
Specifies asynchronous operation.
&S0
Keeps DSR on.
(
default
)
122
IBM ThinkPad 570 Online Book