Digi 90031300 Sn Data Set Ready Option, Tn Self Test Commands, Returned when n = 0, 3, 4, 5, 7 or

&Sn Data Set Ready Option

Controls the functions of DSR. DSR indicates when the modem is connected to a communications channel and is ready. Async mode only. If the modem is in Sync mode, DSR is on during handshake and when on- line. DSR is off in test or idle mode.

*&S0: DSR always on.

&S1: DSR on during handshake and when on-line; off in test or idle modes.

Result Codes:

OK Returned when n = 0 or 1.

ERROR Returned for any other value of n.

&Tn Self Test Commands

Used to configure and place the modem in various test modes as defined by CCITT V.54. These tests are typically used to verify the analog and digital portions of a modem’s operation.

&T0: Terminate test.

&T1: Local analog loopback.

O:low frequency band.

A:high frequency band.

&T3: Local activate remote digital loopback (RDL).

*&T4: Grant request from remote for RDL test.

&T5: Deny request from remote for RDL test.

&T6: Remote digital loopback test.

&T7: Remote digital loopback with self test.

&T8: Local analog loopback with self test.

Result Codes:

OK Returned when n = 0, 3, 4, 5, 7 or 8.

CONNECT Returned when n = 1 or 6.

ERROR Returned for any other value of n.

108 T1 Modem Bank