|
 The
Modem-Controller is designed to work in conjunction with modems
which require explicit control of the handshaking protocol. There
are a number of complications in using this type of modem; the
software to handle the hardware handshaking require performing
the necessary checks on the DCD, RTS and CTS lines. This is made
more complex by the increasing layers of protection employed in
newer versions of the Windows operating systems.
The Modem-Controller is essentially a data buffer with access
to the modem control lines. By suitable configuration, the controller
enables several such modems to be operated in a half-duplex mode
on the same frequency without interference. This facilitates the
operation of three or more modems concurrently - e.g. one remote
control station and multiple vehicles.
|