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<strong>AT</strong> <strong>Commands</strong> <strong>Reference</strong> <strong>Manual</strong><br />
&C - RLSD (DCD) Option<br />
The modem controls the RLSD output in accordance with the parameter supplied. The<br />
parameter value, if valid, is written to S21 bit 5.<br />
Syntax<br />
&C<br />
Defined Values<br />
<br />
Decimal number corresponding to the selected option.<br />
0 RLSD remains ON at all times.<br />
1 RLSD follows the state of the carrier. (Default.)<br />
Result Codes<br />
OK 0 or 1.<br />
ERROR<br />
Otherwise.<br />
&D - DTR Option<br />
This command interprets the ON to OFF transition of the DTR signal from the DTE in<br />
accordance with the parameter supplied. The parameter value, if valid, is written to S21<br />
bits 3 and 4. Also, see S25.<br />
Syntax<br />
&D<br />
Defined Values<br />
<br />
Decimal number corresponding to the selected option.<br />
0 DTR drop is interpreted according to the current<br />
&Qn setting as follows:<br />
&Q0, &Q5, &Q6: DTR is ignored (assumed<br />
ON). Allows operation with DTEs which do not<br />
provide DTR.<br />
&Q1: DTR drop causes the modem to hang up.<br />
Auto-answer is not affected.<br />
&Q2, &Q3: DTR drop causes the modem to<br />
hang up. Auto-answer is inhibited.<br />
1 DTR drop is interpreted according to the current<br />
&Qn setting as follows:<br />
&Q0, &Q1, &Q5, &Q6: DTR drop is interpreted<br />
by the modem as if the asynchronous escape<br />
sequence had been entered. The modem returns<br />
to asynchronous command state without<br />
disconnecting.<br />
100722B Conexant 3-23
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