AT Commands
Dial tone detect
Disabled: The modem dials a call regardless of whether it detects a dial tone.
Enabled: The modem dials only upon detection of a dial tone, and disconnects the call if the dial tone is not detected within 10 seconds.
Busy tone detect
Disabled: The modem ignores any busy tones it receives.
Enabled: The modem monitors for busy tones.
Result Codes:
OK n=0,1,2,3,4,5
ERROR Otherwise
Zn Recall stored profile
The modem performs a soft reset and restores (recalls) the configuration profile according to the parameter supplied. If no parameter is specified, zero is assumed. Either Z0 or Z1 restores the profile.
Result Codes: OK n=0,1 ERROR Otherwise
&Cn Data Carrier Detect (DCD) control
Data Carrier Detect is a signal from the modem to the computer indicating that a carrier signal is being received from a remote modem. DCD normally turns off when the modem no longer detects the carrier signal.
&C0 The state of the carrier from the remote modem is ignored. DCD circuit is always on.
&C1 DCD turns on when the remote modem’s carrier signal is detected, and off when the carrier signal is not detected (default).
Result Codes: OK n=0,1 ERROR Otherwise
&Dn DTR control
This command interprets how the modem responds to the state of the DTR signal and changes to the DTR signal.
&D0 Ignore. The modem ignores the true status of DTR and treats it as always on. This should only be used if your communication software does not provide DTR to the modem
&D1 If the DTR signal is not detected while in
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