Furuno Felcom 30 Operator's Manual page 149

A T X 4 R
basic message set extended with all of the above.
Default
A T Z
R
resets the Mobile Data Service configuration to last saved command. Also clears
the call if used when in Online Command Mode.
repeats last command.
A /
Re-executes the last AT command string issued to the Mobile Data Service,
including redialing a telephone number.
Extended AT commands
[n]
A T & C
R
determines the Data Carrier Detect (DCD) behaviour:
A T & C 0
R
A T & C 1 R
[n]
A T & D
R
selects the Data Terminal Ready (DTR) behaviour:
A T & D 0
R
A T & D 1 R
when DTR goes inactive.
A T & D 2
R
inactive. Default.
A T & F
R
resets the Mobile Data Service to factory default. The factory default is not
saved as with the AT&W command, so ATZ revokes to last saved values.
sets DCD always ON.
sets DCD, only when connected. Default.
the Mobile Data Service ignores DTR.
the Mobile Data Service enters Online Command Mode
the Mobile Data Service clears call when DTR goes
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