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CHAPTER 4: AT Commands, S-Registers, and Result Codes
Command: &Cn 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: &En 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: &Fn Load Factory Settings
Values: n=0
Default: None
Description: &F0 Load factory settings as active configuration.
Command: &Gn 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.