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4 AT Commands, S-Registers, and Result Codes
27
MultiModemZPX User Guide
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: &E
n
XON/XOFF Pacing Control
Values: n = 12 or 13
Default: 12
Description: &E12 Disables XON/XOFF pacing.
&E13 Enables XON/XOFF pacing. (&K4 must also be set.)
Note: &E13 has no effect if hardware control (&K3) is selected.
Command: &F
n
Load Factory Settings
Values: n = 0
Default: None
Description: &F0 Loads 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 Disables guard tone.
&G1 Sets guard tone to 550 Hz.
&G2 Sets guard tone to 1800 Hz.
Note: The &G command is not used in North America.
Command: &K
n
Flow Control Selection
Values: n = 0, 3, or 4
Defaults: 3
Description: &K0 Disables flow control.
&K3 Enables CTS/RTS hardware flow control.
&K4 Enables XON/XOFF software flow control.
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 estab-
lished, the modem falls back according to the setting in S36.
&Q9 V.42 or MNP error control mode. If neither error control is es-
tablished, the modem falls back according to the setting in S36.