3 - AT Commands, S-Registers and Result Codes
31
Command:
X
n
Result Code Selection
Values:
n = 0–4
Default:
4
Description: X0
Basic Result Codes (
e.g., CONNECT); does not
look for dial tone or busy signal.
X1
Extended Result Codes (
CONNECT 33600 V42bis,
etc.); 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.
Command:
Y
n
Long Space Disconnect
Values:
n = 0
Default:
0
Description: Y0
Disable sending or responding to long space break
signal on disconnect.
Y1
Enable sending or responding to long space break
signal on disconnect. (Not supported.)
Command:
Z
n
Modem Reset
Values:
n = 0 or 1
Default:
None
Description: Z0
Reset modem to profile saved by the last
&W
command.
Z1
Same as Z0.
Command:
&C
n
Data Carrier Detect (DCD) Control
Values:
n = 0 or 1
Default:
1
Description: &C0
Ignores the state of carrier on the remote modem
and DCD circuit is always on.
&C1
DCD turns on when the remote modem’s carrier
signal is detected and DCD is off when the carrier
signal is not detected.
