beautypg.com

Dial tone detect, Busy tone detect, Zn recall stored profile – Toshiba M400 User Manual

Page 240: Cn data carrier detect (dcd) control, Dn dtr control

background image

C-6

User’s Manual

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 on-line data mode,
the modem enters command mode, issues an OK result
code, and remains connected.