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:

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:

&Bn

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:

&Cn

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:

&Dn

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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Multi-Tech Systems MT5634MSV manual Long Space Disconnect, Modem Reset, Auto Retrain, Data Carrier Detect DCD Control