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DCD turns on when the remote modem’s carrier signal is detected and DCD is off when the carrier signal is not detected.

 

 

3 - AT Commands, S-Registers and Result Codes

Command:

Xn

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:

Yn

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:

Zn

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:

&Cn

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

 

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Multi-Tech Systems MT3334ZDX Result Code Selection, Long Space Disconnect, Modem Reset, Data Carrier Detect DCD Control