Digi 90031300 Bn Autoretrain, Cn Data Carrier Detect Option Async Only, Load Factory Settings

AT& (Ampersand) Commands

&Bn 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 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.

&Cn 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 &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.

&Dn 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.

&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.

&F: Recall factory setting as active configuration.

Appendix F 105