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Command:
&Cn
Data Carrier Detect (DCD) Control
Values:
n = 0, 1, 2
Default:
1
Description:
&C0
&C1 DCD goes ON when the remote modem's carrier signal is detected, and goes OFF
&C2 DCD turns OFF upon disconnect for time set by S18. It then goes high again (for some
Command:
&Dn
Data Terminal Ready (DTR) Control
Values:
n = 0, 1, 2, or 3
Default:
2
Description:
&D0
&D1
&D2
&D3
Command:
&En
XON/XOFF Pacing Control
Values:
n = 12 or 13
Default:
12
Description:
&E12 Disables XON/XOFF pacing.
&E13 Enables XON/XOFF pacing.
Command:
&Fn
Load Factory Settings
Values:
n = 0
Default:
None
Description:
&F0
Note:
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:
Command:
&Kn
Flow Control Selection
Values:
n = 0, 3, or 4
Defaults:
3
Description:
&K0
&K3
&K4
Multi-Tech Systems, Inc. MultiAccess User Guide
Forces the DCD circuit to be always ON.
when the carrier signal is not detected.
PBX phone systems).
Modem ignores true status of DTR signal and responds as if it is always on.
If DTR drops while in online data mode, the modem enters command mode, issues
an OK, and remains connected.
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.
If DTR drops, modem hangs up and resets as if ATZ command were issued.
Load factory settings as active configuration.
See also the Z command.
The &G command is not used in North America.
Disable flow control.
Enable CTS/RTS hardware flow control.
Enable XON/XOFF software flow control.
Appendix F – Modem AT Commands
57
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