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4 AT Commands, S-Registers, and Result Codes
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:
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:
&B n V.32 Auto Retrain
Values:
n = 1
Default:
1
Description:
&B0
Disable V.32 auto retrain. (Not supported.)
&B1
Enable V.32 auto retrain.
Command:
&C n 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 de-
tected, and goes low when the carrier signal is not detected.
Command:
&D n Data Terminal Ready (DTR) Control
Values:
n = 0, 1, 2, or 3
Default:
2
Description:
&D0 Modem ignores the true status of the DTR signal and responds
as if it is always on.
&D1 If DTR drops while in online data mode, the modem enters
command mode, issues an OK, and remains connected.
&D2 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.
&D3 If DTR drops, the modem hangs up and resets as if an ATZ
command were issued.
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