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CHAPTER 5: AT Commands, S-Registers, and Result Codes
Command:
Xn
Result Code Selection
Values:
n = 0–7
Default: 4
Description:
X0
Basic result codes (for example, CONNECT); does
not look for dial tone or busy signal.
X1
Extended result codes (for example, CONNECT
46000 V42bis); does not look for dial tone or busy
signal.
X2
Extended result codes with NO DIALTONE; does not
look for busy signal.
X3
Extended result codes with BUSY; does not look for
dial tone.
X4
Extended result codes with NO DIALTONE and
BUSY.
X5
Extended result codes with NO DIALTONE and
BUSY.
X6
Extended result codes with NO DIALTONE and
BUSY.
X7
Basic result codes with NO DIALTONE and BUSY.
Command:
Zn
Modem Reset
Values:
n = 0 or 1
Default: None
Description:
Z0
Resets modem to profile saved by the last &W
command.
Z1 Same
as
Z0
.
Command:
&Cn
Data Carrier Detect (DCD) Control
Values:
n = 0, 1, or 2
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 on disconnect for time set by S18, then
goes high again (for some CBX phone systems).
