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Chapter 2 – AT Commands
Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F) 10
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
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).