Rockwell RCV144ACx, Command Reference Manual, Page: 34 / 186

AT Command Reference Manual
3-16 1048
&Mn - Asynchronous/Synchronous Mode Selection
This command determines the DTR operating mode. The modem treats the &M command as a subset of the &Q command.
&M0 Selects direct asynchronous operation. Note that the command sequence &M0\N0 selects normal
buffered mode, but the command sequence \N0&M0 selects direct mode. This is because the \N0
command is analogous to the &Q6 command. The value 000b is written to S27 bits 3, 1, and 0,
respectively. (See &Q).
&M1 Selects synchronous connect mode with async off-line command mode. The value 001b is written
to S27 bits 3, 1, and 0, respectively. (Serial interface operation only.)
&M2 Selects synchronous connect mode with async off-line command mode. Same as &M1 except
that &M2 enables DTR dialing of directory slot 0. The modem will disconnect if DTR is OFF for
more than the period in S25 (in units of hundredths of a second): the data connection will be
synchronous. The value 010b is written to S27 bits 3, 1, and 0, respectively. (Serial interface
operation only.)
&M3 Selects synchronous connect mode. This mode allows DTR to act as a talk/data switch. The call
is manually initiated while DTR is inactive. When DTR becomes active, the handshake proceeds
in originate or answer mode according to S14 bit 7. The value 011b is written to S27 bits 3, 1, and
0, respectively. (Serial interface operation only.)
Result Codes:
OK n = 0 to 3.
ERROR Otherwise.
&Pn - Select Pulse Dial Make/Break Ratio
This command determines the make/break ratio used during pulse dialing. It is only effective if the appropriate bit to enable
this command is set through the ConfigurACE program. If enabled, it will override the make/break ratios in the OEM
parameters in ConfigurACE. The default is country-dependent. The parameter value, if valid, is written to S28 bits 3 and 4.
&P0 Selects 39%-61% make/break ratio at 10 pulses per second. (Default.)
&P1 Selects 33%-67% make/break ratio at 10 pulses per second.
&P2 Selects 39%-61% make/break ratio at 20 pulses per second.
&P3 Selects 33%-67% make/break ratio at 20 pulses per second.
Result Codes:
OK n = 0 to 3.
ERROR Otherwise.