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ASL Holdings Limited 19/09/2005 11
Draft Copy Version 2c
AT &C
Carrier control. This parameter defines the operation of pin 8 (DCD) of the
RS 232C interface.
AT &C0 = Always on
AT &C1 = Fixed to this setting – Carrier goes high when on line.
AT &C3 = Off in command mode – On when modem on line
For compatibility only. ie modem will respond with OK but not take any action.
AT &D
Data Terminal Ready options
This command controls the handling of the DTR line. (Pin 20).
AT&D0 - DTR state is ignored and no action is taken. This is the equivalent of
holding DTR permanently active (high).
AT&D1 - Returns the modem to command mode on loss of DTR. This is the
same as issuing the +++ escape sequence, i.e. the modem will go into
command mode, but will not drop the line.
AT&D2 - Prevents the modem from originating or answering a call unless
DTR is raised by the DTE, and if the modem is online when DTR drops, the
call will be disconnected.
AT &F
Restore Factory Configuration
Configures the modem to factory default settings
(Does not default AT+ autosave commands).
AT&V
This command shows the general set up of the modem. Displays, for example
(Version 3.03 firmware):
at&Ve?v?q?x?&c?&d?s0?s2?s3?+cbst?
306 v3.03 S1 1200N G0 P0
E: 1
V: 1
Q: 0
X: 4
&C: 1
&D: 0
001 (S reg. 1)
043 (S reg. 2)