AOpen FM56-ITU/2 Manual page 43

AT&Q4
S27 bits 3, 1, and 0, respectively AutoSync operation, when used in conjunction
with the Hayes Synchronous Interface (HSI) capability in the DTE, provides
synchronous communication capability from an asynchronous terminal.
desired values before selecting AutoSync operation with &Q4.After the
CONNECT message is issued, the modem waits the period message of time
specified by S25 before examining DTR. If DTR is on, the modem enters the
synchronous operating state; if DTR is off, the modem terminates the line
connection and returns to the asynchronous command state.
of carrier or the on-to-off transition of DTR. Loss of carrier will cause the modem
to return to the asynchronous command state.An on-to-off transition of DTR will
cause the modem to return to the synchronous command state and either not
terminate the line connection (&D1 active) or terminate the line connection (any
other &Dn command active).
AT&Q5
The modem can be configured using S36 to determine whether a failure will
result in the modem returning on-hook or will result in fallback to an
asynchronous connection. The value 101b is written to S27 bits 3,1,and
0,respectively.(Default)
AT&Q6
buffering). The value 110b is written to S27 bits 3,1,and 0, respectively.
AT&Rn RTS/CTS Option
This selects how the modem controls CTS. CTS operation is modified
if hardware flow control is selected (see &K command). The parameter value, if
valid, is written to S21 bit 2.
AT&R0
RTS-to-CTS delay is defined by S26. In async mode. CTS acts according
toV.25bis handshake.
AT&R1
ignored).
control.(Default)
AT&Sn DSR Override
AT&S0
AT&S1
detected and inactive after the carrier has been lost.
AT&Tn Test and Diagnostics
The modem will perform selected test and diagnostic functions
according to the parameter supplied. A test can be run only when in an
asynchronous operation in non-error-correction mode (normal or direct mode).
Selects AutoSync operation.The value 100b is written to
Starting AutoSync. Set registers S19, S20, and S26 to the
Stopping AutoSync.AutoSync operation is stopped upon loss
The modem will try to negotiate an error-corrected link.
Selects asynchronous operation in normal mode (speed
In sync mode. CTS tracks the state of RTS. The
In sync mode, CTS is always ON (RTS transition are
In async mode. CTS will only drop if required by flow
DSR will remain ON at all times.(Default)
DSR will become active after answer tone has been