Asynchronous Mode &Q0
In this mode, the modem transmits and receives characters asynchronously
to and from the local data terminal at the same nominal speed as the modem
connection. Asynchronous mode can be selected with the &Q0 command option.
The asynchronous mode supports both the online and the online command
states. When connected to an asynchronous data terminal, the modem can
be configured, used as a dialer, and placed online for data communications.
If the modem receives a character while dialing the telephone number, it
aborts the call and sends the OK result code; if a character is received
after dialing but prior to the completion of the connection, it aborts the
call and sends the NO CARRIER result code.
The modem exits the online state and returns to the command state when a
loss of carrier exceeding the time interval stored in S10 is detected. For
the responses associated with transitions of the DTR signal for this mode,
see the &D command.
The following diagram illustrates modem operation in asynchronous mode.
