MultiModemDSVD User Guide | 4 AT Commands, | |
Command: | &Mn | Communications Mode |
Values: |
| n = 0 |
Default: |
| 0 |
Description: |
| This command determines the DTR operating mode. The mo- |
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| dem treats the &M command as a subset of the &Q command. |
| &M0 | Selects direct asynchronous operation. Note that the command |
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| sequence &M0\N0 selects normal buffered mode, but the |
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| command sequence \N0&M0 selects direct mode. This is be- |
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| cause the \N0 command is analogous to the &Q6 command. |
Command: | &Pn | Pulse Dial Make/Break Ratio |
Values: |
| n = 0 |
Default: |
| 0 |
Description: | &P0 | Selects a make/break dial ratio of 39:61 at 10 pulses per sec- |
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| ond. |
Command: | &Qn | Asynchronous Communications Mode |
Values: |
| n = 0, 5, 6 |
Default: |
| 5 |
Description: |
| This command is an extension of the &M command, and is used |
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| to control which connection modes are permitted. It is used in |
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| conjunction with S36 and S48. (See also the \N command.) |
| &Q0 | Selects direct asynchronous operation. See &M0. |
| &Q5 | The modem will try to negotiate an |
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| modem can be configured using S36 to determine whether a |
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| failure will result in the modem disconnecting or falling back |
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| to a |
| &Q6 | Selects asynchronous operation with speed buffering and no |
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| error correction. Same as \N0. |
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 | V.54 Test Commands |
Values: |
| n = 0, 1, 3, 4, 5, 6, 7, or 8 |
Default: |
| None |
Description: |
| The modem can perform selected test and diagnostic functions. |
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| A test can be run only when the modem is in asynchronous |
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| operation in |
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| For tests 3, 6, and 7, a connection between the two modems |
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| must first be established. To terminate a test in progress, the |
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| escape sequence (+++) must be entered first, except for param- |
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| eters 7 and 8. If S18 is |
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| after the time specified by S18 and displays the OK message. |
| &T0 | Abort. Stop any test in progress. |
| &T1 | Start local analog loopback, V.54 Loop 3. If a connection exists |
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| when this command is issued, the modem hangs up. The CON- |
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| NECT XXXX message is displayed upon the start of the test. |
36 |