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4 AT Commands, S-Registers, and Result Codes
Command:
X n
Result Code Selection
Values:
n = 0–4
Default:
4
Description:
This command selects which subset of the result messages will
be used by the modem to inform the computer of the results of
commands.
X0
Sends OK, CONNECT, RING, NO CARRIER, ERROR and NO
ANSWER; does not look for dial tone or busy signal.
X1
Sends X0 messages and connect speed; does not look for dial
tone or busy signal.
X2
Sends X1 messages with NO DIALTONE; does not look for
busy signal.
X3
Sends X1 messages with BUSY; does not look for dial tone.
X4
Sends all messages, including NO DIALTONE and BUSY.
Note: If the modem is in fax mode, the only message sent to
indicate a connection is CONNECT without a speed indication.
See also the \V command.
Command:
Y n
Long Space Disconnect
Values:
n = 0 or 1
Default:
0
Description:
Y0
Disable sending or responding to long space break signal on
disconnect.
Y1
Enables long space disconnect. In non-error correction mode,
the modem sends a long space of four seconds prior to going
on-hook. In non-error correction mode, the modem responds
to the receipt of a long space (i.e., a break signal greater than
1.6 seconds) by going on-hook.
Command:
Z n
Modem Reset
Values:
n = 0 or 1
Default:
None
Description:
The modem performs a soft reset and restores (recalls) the con-
figuration profile according to the parameter supplied. If no
parameter is specified, zero is assumed.
Z0
Reset modem to profile saved by the last &W command (pro-
file 0).
Z1
Reset modem and restore stored profile 1.
Command:
&C n Data Carrier Detect (DCD) Control
Values:
n = 0 or 1
Default:
1
Description:
&C0 Forces the DCD circuit to always be high.
&C1 DCD goes high when the remote modem's carrier signal is de-
tected, and goes low when the carrier signal is not detected.
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