Filter
Top Products
31
Chapter 4 - AT Commands, S-Registers and Result Codes
Command: &D
n
Data Terminal Ready (DTR) Control
Values:
n
= 0, 1, 2, or 3
Default: 2
Description:&D0 Modem ignores the true status of the DTR signal and responds as if it is always on.
&D1 If DTR drops while in online data mode, the modem enters command mode, issues an
OK
,
and remains connected.
&D2 If DTR drops while in online data mode, the modem hangs up. If the signal is not present,
the modem will not answer or dial.
&D3 If DTR drops, the modem hangs up and resets as if an ATZ command were issued.
Command: &F
n
Load Factory Settings
Values:
n
= 0
Default: None
Description:&F0 Load factory settings as active configuration.
Note: See also the
Z
command.
Command: &G
n
V.22bis Guard Tone Control
Values:
n
= 0, 1, or 2
Default: 0
Description:&G0 Disable guard tone.
&G1 Set guard tone to 550 Hz.
&G2 Set guard tone to 1800 Hz.
Note: The
&G
command is not used in North America.
Command: &J
n
Auxiliary Relay Control
Values: n
= 0
Default: 0
Description:&J0 The auxiliary relay is never closed.
&J1 Not supported—responds
ERROR
.
Command: &K
n
Flow Control Selection
Values:
n
= 0, 3, or 4
Defaults: 3
Description:&K0 Disable flow control.
&K3 Enable CTS/RTS hardware flow control.
&K4 Enable XON/XOFF software flow control.
Command: &M
n
Communications Mode
Values:
n
= 0
Defaults: 0
Description:&M0 Asynchronous mode.
&M1 Not supported—responds
ERROR
.
Command: &Q
n
Asynchronous Communications Mode
Values:
n
= 0, 5, 6, 8, or 9
Default: 5
Description:&Q0 Asynchronous with data buffering. Same as
\N0
.
&Q5 Error control with data buffering. Same as
\N3
.
&Q6 Asynchronous with data buffering. Same as
\N0
.
&Q8 MNP error control mode. If MNP error control is not established, the modem falls back ac-
cording to the setting in
S36
.
&Q9 V.42 or MNP error control mode. If neither error control is established, the modem falls
back according to the setting in
S36
.