Chapter 2 – AT Commands

Command:

&Wn

Store Current Configuration

Values:

 

n= 0 or 1

Default:

 

None

 

Description:

 

&W0

Stores current modem settings in nonvolatile memory as Profile 0. Profile 0 is

 

 

 

loaded instead of the factory defaults at power-on (if &Y0 is set) and by the ATZ

 

 

 

command.

 

 

&W1

Stores current modem settings in nonvolatile memory as Profile 1. Profile 1 is

 

 

 

loaded instead of the factory defaults at power-on (if &Y1 is set) and by the ATZ1

 

 

 

command.

 

 

Note: See also the Z, &F, and &Y commands.

Command: &Xn

Synchronous Clock Source

 

 

Note: For use with MT5600BA and MT5600BR only.

Values:

 

n= 0, 1, or 2

Default:

 

0

 

Description:

 

Selects the source of the transmit clock for synchronous mode. In asynchronous mode,

 

 

the transmit and receive clocks are turned off. In synchronous mode, the clocks are turned

 

 

on with a frequency of 1200 Hz or faster corresponding to the speed selected for modem

 

 

operation.

 

 

Note: Synchronous Online (&M1) must be enabled before you can set the synchronous

 

 

 

clock.

 

 

&X0

Selects internal timing. The modem generates the transmit clock signal and applies

 

 

 

it to the TXCLK output at the serial interface.

 

 

&X1

Selects external timing. The local DTE sources the transmit clock signal on the

 

 

 

XTCLK input of the serial interface. The modem applies this clock to the TXCLK

 

 

 

output at the serial interface.

 

 

&X2

Selects slave receive timing. The modem derives the transmit clock signal from the

 

 

 

incoming carrier and applies it to the TXCLK output at the serial interface.

Command:

&Yn

Select Profile for Hard Reset

Values:

 

n = 0 or 1

Default:

 

None

 

Description:

 

&Y0

Select profile 0 to be loaded on power-up.

 

 

&Y1

Select profile 1 to be loaded on power-up.

 

 

Note: See also the &W and Z commands.

Command: &Zn=x

Store Telephone Number

 

 

(not for the MT5656ZDX and the MT5656ZDX-V).

Values:

 

n = 0–3 (with callback security disabled)

 

 

&Z3 is the phone memory location for leased-line dial back up number

 

 

n = 0-29 (with callback security enabled – for a future release)

 

 

x = Stored telephone number

Default:

 

None

 

Description:

 

Stores telephone dial string x in memory location.

 

 

&Z3 is the phone memory location for leased-line dial back up number.

 

 

Dial the stored number using the ATDS=n command.

 

 

Note: See also the #CBSn command.

Command: %Cn Data Compression Control

Values:

 

n = 0, 1, 2, or 3

Default:

 

3

 

Description:

 

Enables or disables data compression negotiation. The modem can only perform data

 

 

compression on an error-corrected link.

 

 

%C0

Disables data compression.

 

 

%C1

Enables MNP 5 data compression negotiation.

 

 

%C2

Enables V.42bis data compression negotiation.

 

 

%C3

Enables both V.42bis and MNP 5 data compression negotiation.

 

 

Note: This command controls both V.42bis and MNP-5 data compression, whereas the

 

 

 

&E14 and &E15 commands control only V.42bis data compression. The command

 

 

 

in effect is the one last entered.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273G)

11

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Multi-Tech Systems MT5600BA-V92 manual Command Store Current Configuration, Command &Xn Synchronous Clock Source

MT5600BA-V92 specifications

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