Chapter 5 – AT Commands, S-Registers, and Result Codes

Command:

&Sn

Data Set Ready (DSR) Control

Values:

 

n = 0 or 1

Default:

 

0

 

Description:

 

&S0

DSR is always high (on).

 

 

&S1

DSR goes high only during a connection.

Command:

&Tn

Loopback Test (V.54 Test) Commands

Values:

 

n = 0, 1, 3, 6

Default:

 

None

 

Description:

 

The modem can perform selected test and diagnostic functions. A test can be run only when

 

 

the modem is operating in non-error-correction mode (normal or direct mode). For tests 3

 

 

and 6, a connection between the two modems must be established. To terminate a test in

 

 

progress, the escape sequence (+++AT) must be entered.

 

 

&T0

Stops any test in progress.

 

 

&T1

Starts a local analog loopback, V.54 Loop 3, test. If a connection exists when this

 

 

 

command is issued, the modem hangs up. When the test starts, a CONNECT

 

 

 

message is displayed.

 

 

&T3

Starts local digital loopback, V.54 Loop 2, test. If no connection exists, ERROR is

 

 

 

returned.

 

 

&T6

Initiates a remote digital loopback, V.54 Loop 2, test without self-test. If no connection

 

 

 

exists, ERROR is returned.

Command:

&V

Display Current Settings

Values:

 

n/a

 

Description:

 

Displays the active modem settings.

Command:

&Wn

Store Current Configuration

Values:

 

n = 0 or 1

Default:

 

1

 

Description:

 

&W0 Stores current modem settings in non-volatile memory and causes them to be loaded

 

 

 

at power-on

 

 

 

or following the ATZ command instead of the factory defaults. See also the &F

 

 

 

command.

 

 

&W1 Clears user default settings from non-volatile memory and causes the factory defaults

 

 

 

to be loaded at power-on or following the ATZ command.

Command:

&Zy=x

Store Dialing Command

Values:

 

y = 0–2

 

 

x = Dialing command

Default:

 

None

 

Description:

 

Stores dialing command x in memory location y. Dial the stored number using the command

 

 

ATDS=y. See Also the #CBS command, a callback security command.

Command:

\An

Select Maximum MNP Block Size

Values:

 

n = 0, 1, 2, or 3

Default:

 

3

 

Description:

 

\A0

64-character maximum.

 

 

\A1

128-character maximum.

 

 

\A2

192-character maximum.

 

 

\A3

256-character maximum.

Command:

\Bn

Transmit Break

Values:

 

n = 0–9 in 100 ms units

Default:

 

3

 

Description:

 

In non-error-correction mode only, sends a break signal of the specified length to a remote

 

 

modem. Works in conjunction with the \K command.

SocketModem Global MT5634SMI Developer’s Guide

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Technics MT5634SMI-34, MT5634SMI-92 manual Zy=x Store Dialing Command, An Select Maximum MNP Block Size, Bn Transmit Break