User`s guide

AT Commands and S-Registers
B-14 Issue 3 October 1995
Table B-1. AT Command and S-Register List (14 of 21)
AT Command/
S-Register
Description
&D n DTR (DATA TERMINAL READY) ACTION
Determines the handling of the Data Terminal Ready
signal.
&D, &D0 Interprets DTR according to the value of
&Q
n as follows:
&Q0, &Q6: DTR is ignored (assumed on).
&Q1: When DTR turns Off, the modem
hangs up. Auto-answer is not affected.
&Q2, &Q3: When DTR turns Off, the
modem hangs up. Auto-answer is disabled.
&D1 Interprets DTR according to the value of
&Q
n as follows:
&Q0, &Q1, &Q6: When DTR turns off, the
modem returns to asynchronous command
state without disconnecting.
&Q2, &Q3: When DTR turns Off, the
modem hangs up. Auto-answer is disabled
&D2 Interprets DTR according to the value of
&Q
n as follows:
&Q0, &Q1, &Q6: When DTR turns Off,
the modem hangs up. Auto-answer is
disabled.
&D3 Interprets DTR according to the value of
&Q
n as follows:
&Q0, &Q1, &Q6: When DTR turns off, the
modem performs a soft reset as if the Z
command were received.
&Q2, &Q3: When DTR turns Off, the
modem hangs up. Auto-answer is disabled.