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&Q2,&Q3 DTR drop causes the modem to hang up. Auto-answer
is inhibited.
AT&Fn Restore Factory Configuration (Profile)
The modem loads the factory default configuration (profile).The
factory defaults are identified for each command and in the S-Register
descriptions. A configuration profile consists of a subset of
S-Registers.
AT&F0 Restore factory configuration 0.
AT&F1 Restore factory configuration 1.
AT&Gn Select Guard Tone
The modem generates the guard tone selected by this command according
to the parameter supplied (DPSK modulation modes only). The
parameter value, if valid, is written to S23 bits 6 and 7.
AT&G0 Disables guard tone. (Default)
AT&G1 Disables guard tone.
AT&G2 Selects 1800 Hz guard tone.
AT&Kn Flow control
This command defines the DTE/DCE (terminal/model)flow control mechanism.
The parameter value, if valid, is written to S39 bits 0,1,and 2.
AT&K0 Disables flow control.
AT&K3 Enables RTS/CTS flow control.(Default for data modem modes.)
AT&K4 Enables XON/XOFF flow control.
AT&K5 Enables transparent XON/XOFF flow control.
AT&K6 Enables both RTS/CTS and XON/XOFF flow control.(Default for fax
modem modes.)
AT&Mn Asynchronous/Synchronous Mode Selection (External Models Only)
AT&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).
AT&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.)
AT&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.)
AT&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 S 14 bit 7.
The value 010b is written to S27 bits 3, 1, and 0,
respectively. (Serial interface operation only.)
