Chapter 2 – AT Commands

Command:

&Pn Make/Break Dial Ratio

Values:

n = 0, 1, 2,3

Default:

Varies by country/region

Description:

&P0

Make/Break dial ratio of 39/61 at 10 pps

 

&P1

Make/Break dial ratio of 33/67 at 10 pps

 

&P2

Make/Break dial ratio of 39/61 at 20 pps

 

&P3

Make/Break dial ratio of 33/67 at 20 pps

Command:

&Qn Sync/Async Mode

 

Note: The MT5600ZDX does not support Sync mode.

Values:

n =0-3, 5, 6

Default:

5

 

Description:

This command is an extension of &M and is used to control which connection modes are

 

permitted. It is used in conjunction with S36 and S48. (See also the \N command.)

 

&Q0

Selects direct asynchronous operation. See &M0.

 

&Q1

Selects synchronous connect mode with asynchronous offline command mode.

 

 

See &M1. Serial interface operation only.

 

&Q2

Selects synchronous connect mode with asynchronous offline command mode;

 

 

enables DTR dialing of directory 0. See &M2. Serial interface only.

 

&Q3

Selects synchronous connect mode with asynchronous offline command mode;

 

 

enables DTR to act as a talk/data switch. See &M3. Serial only.

 

&Q5

The modem will try to negotiate an error-corrected link. It can be configured using

 

 

S36 to determine whether a failure will result in disconnecting or falling back to a

 

 

non-error-correction connection. See also \N3.

 

&Q6

Selects asynchronous operation with speed buffering and no error correction.

 

 

Same as \N0.

Command:

&Rn Clear to Send (CTS) Control

Values:

n = 0 or 1

Default:

1

 

Description:

&R0

Lets the CTS state follow the RTS state when online..

 

&R1

Forces CTS high (ON).

 

Note: This command applies only in synchronous mode.

Command:

&Sn Data Set Ready (DSR) Control

Values:

n = 0 or 1

Default:

0

 

Description:

&S0

Forces DSR high (on) at all times.

 

&S1

Lets 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.

 

&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.

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).

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

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Multi-Tech Systems MT5600BA-V92 Command Make/Break Dial Ratio, Command Sync/Async Mode, Command Clear to Send CTS Control

MT5600BA-V92 specifications

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