Multitech BL-Series User Manual download pdf (Page 12)

AT Commands for the MT5656ZDX, MT5600ZDX, MT5600BA/BL-Series Modems

Multi-Tech Systems, Inc. Commands Reference Guide (PN S000273D)

Command: &Sn Data Set Ready (DSR) Control

Values: n = 0 or 1

Default: 0

Description: &S0 Force DSR high (on) at all times.

&S1 Let DSR go high only during a connection.

Command: &Tn Local Analog Loopback Test

Values: n = 0, 1

Default: None

Description: The modem will perform the local analog loopback test if &T1 is selected. The test can be run

only when the modem is in asynchronous operation in non-error-correction mode (normal),

AT&Q6. To terminate a test in progress, the escape sequence (+++) must be entered first.

(See the MT5600BA/BL V.90 Section for more options).

&T0 Terminates any test in progress. Clears S16.

&T1 Starts local analog loopback, V.54 Loop 3. Sets S16 bit 0. If a connection exists when

this command is issued, the modem hangs up. A CONNECT XXXX message is

displayed at the start of the test.

MT5600BA LCD:

Not supported in MT5600BA V.92

Command: &Vn Display Current Configuration and Statistics for Last Connection

Values: 0, 1

Default: None

Description: &V0 Displays the current (active) configuration.

&V1 Displays statistics for the last connection. Not available in all versions.

Note: See also the L5 command. (L5 is not supported in MT5656ZDX).

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 (MT5600BA 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.

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Multitech BL-Series User Manual Page 12

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