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Chapter 10 − Modem Mode AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. MultiConnect Serial-to-Serial Adapter User Guide (S000354A) 92
Command: Xn Extended Result Codes and Call Progress Information
Values: n = 0–4
Default: 4
Description: This command selects the subset of the result code messages used by the modem to inform
the DTE of the results of commands. See Extended Results Code Chart in the Results Code
section of this chapter.
X0 Disables reporting of busy tones unless forced otherwise by country requirements; send
only OK, CONNECT, RING, NO CARRIER, ERROR, and NO ANSWER result codes.
Blind dialing is enabled/disabled by country parameters. If busy tone detection is
enforced and busy tone is detected, NO CARRIER will be reported. If dial tone detection
is enforced or selected and dial tone is not detected, NO CARRIER will be reported
instead of NO DIAL TONE. The value 000b is written to S22 bits 6, 5, and 4,
respectively.
X1 Disables reporting of busy tones unless forced otherwise by country requirements; send
only OK, CONNECT, RING, NO CARRIER, ERROR, NO ANSWER, and CONNECT
XXXX (XXXX = rate). Blind dialing enabled/disabled by country parameters. If busy tone
detection is enforced and busy tone is detected, NO CARRIER will be reported instead
of BUSY. If dial tone detection is enforced or selected and dial tone is not detected, NO
CARRIER will be reported instead of NO DIAL TONE. The value 100b is written to S22
bits 6, 5, and 4, respectively.
X2 Disables reporting of busy tones unless forced otherwise by country requirements; send
only OK, CONNECT, RING, NO CARRIER, ERROR, NO DIAL TONE, NO ANSWER,
and CONNECT XXXX. If busy tone detection is enforced and busy tone is detected, NO
CARRIER will be reported instead of BUSY. If dial tone detection is enforced or
selected and dial tone is not detected, NO DIAL TONE will be reported instead of NO
CARRIER. The value 101b is written to S22 bits 6, 5, and 4, respectively.
X3 Enables reporting of busy tones; send only OK, CONNECT, RING, NO CARRIER,
ERROR, NO ANSWER, and CONNECT XXXX. Blind dialing is enabled/disabled by
country parameters. If dial tone detection is enforced and dial tone is not detected, NO
CARRIER will be reported. The value 110b is written to S22 bits 6, 5, and 4,
respectively.
X4 Enables reporting of busy tones; send all messages. The value 111b is written to S22
bits 6, 5, and 4, respectively. (Default.)
Command:
Zn Soft Reset and Restore Profile
Values: n = 0 or 1
Default: None
Description: Causes the modem to perform a soft reset and restore (recall) of the factory default
configuration profile.
Z0 Soft reset and restore stored profile 0.
Z1 Soft reset and restore stored profile 1. (Not available in V.22bis except for compatibility).
Command:
&Cn RLSD (DCD) Option
Values: n = 0 or 1
Default: 1
Description:
The modem controls the RLSD output in accordance with the parameter supplied. The
parameter value, if valid, is written to S21 bit 5.
&C0 RLSD remains ON at all times.
&C1 RLSD follows the state of the carrier.
Command:
&Dn Data Terminal Ready (DTR) Option
Values: n = 0, 1, 2, or 3
Default: 2
Description: This command interprets the ON to OFF transition of the DTR signal from the DTE in
accordance with the parameter supplied. The parameter value, if valid, is written to S21 bits
3 and 4. Also, see 25.
&D0 - Allows operation with DTEs which do not provide DTR.
&D1 - DTR drop is interpreted as if the escape sequence had been entered. The modem
returns to the command state without disconnecting.
&D2 - DTR drop causes the modem to hang up. Auto-answer is inhibited. (Default.)
&D3 - DTR drop causes the modem to perform a soft reset as if the Z command were
received. The &Y setting determines which profile is loaded.