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CHAPTER 4: AT Commands, S-Registers, and Result Codes
Command:
&C
n
Data Carrier Detect (DCD) Control
Values:
n
=0 or 1
Default:
1
Description:
&C0
Forces the DCD circuit to be always high.
&C1
DCD goes high when the remote modem’s carrier
signal is detected, and goes low when the carrier
signal is not detected.
&C2
DCD drops briefly following disconnect, then goes
high again. Register S18 defines how long DCD
signal remains low after disconnect.
Command:
&E
n
X-ON/X-OFF Pacing Control
Values:
n
=12 or 13
Default:
12
Description:
&E12
Disables X-ON/X-OFF pacing.
&E13
Enables X-ON/X-OFF pacing. (
&K4
must also be
set.)
NOTE
&E13 has no effect if hardware control (&K3) is selected.
CAUTION
Do not enable pacing unless you need it. Some applications may not
work if pacing is enabled.
Command:
&F
n
Load Factory Settings
Values:
n
=0
Default:
None
Description:
&F0
Load factory settings as active configuration.
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.
