Digi 90031300 User Manual
Appendix F
105
AT& (Ampersand) Commands
&B
n
Autoretrain
Defines modem action when it receives a poor signal.
&B0
:
Hang up on a poor received signal.
*
&B1
:
Retrain on a poor received signal. Hang up if condition persists longer than the threshold set
in register
in register
S7
.
&B2
:
Do not hang up; do not retrain (tolerate any connection).
Result Codes:
OK
Returned when
n
= 0, 1 or 2.
ERROR
Returned for any other value of
n
.
&C
n
Data Carrier Detect Option (Async Only)
Controls how the state of the DCD or RLSD (Receive Line Signal Detect) relates to the carrier from the
remote system. Always use
remote system. Always use
&C1
for Sync mode.
&C0
:
State of carrier from remote modem is ignored. RLSD circuit is always on.
*
&C1
:
State of carrier from remote modem is tracked. RLSD circuit reflects the state of the carrier.
Result Codes:
OK
Returned when
n
= 0 or 1.
ERROR
Returned for any other value of
n
.
&D
n
Data Terminal Ready Option
Defines modem action when it receives a poor signal.
&D0
:
DTR ignored.
&D1
:
Go to command mode when DTR changes from on to off.
*
&D2
:
Hang up and go to command mode when DTR changes from on to off. Auto answer is
disabled if DTR is low.
disabled if DTR is low.
&D3
:
Reset when DTR changes from on to off.
Result Codes:
OK
Returned when
n
= 0, 1, 2 or 3.
ERROR
Returned for any other value of
n
.
&F
Load Factory Settings
Loads the configuration programmed at the factory. This command replaces all command options and S
register settings in the active configuration with the factory values stored in the nonvolatile RAM.
register settings in the active configuration with the factory values stored in the nonvolatile RAM.
&F
:
Recall factory setting as active configuration.