The Model 366 allows
interfacing RS-232 based equipment with networks/equipment using
RS-485. Transmission and reception of data to and from the network
is programmable using dip switches and the RS-232 control signals
RTS (Request to Send) and CTS (Clear to Send). In order to establish
an orderly flow of data on the single twisted pair, the Model 366
offers three choices of data flow control. The user must select the
mode which avoids the contention problem and the possible collision
of data caused by two devices attempting to transmit simultaneously.
In the Model 366 the RTS (Pin 4) and CTS (Pin 5) signals of the
RS-232 connector are jumpered together. This combined signal, which
will be referred to as RTS, is used to control the transmitter and,
depending on the mode, can also control the receiver. There are four
line terminating resistors, dip switch selectable to match the
twisted pair being used.
The Model 366 includes Telebyte's unique patent pending DataSpy LCD
display, which provides the user with important status information
regarding the operation of the device. This LCD operates from less
than one milli-watt of power thereby not affecting the operation of
the Model 366. The LCD is extremely useful during the installation
and checkout and whenever there are suspected problems. The graphic
display presents the user with live status of the transmit and
receive data signals, TD and RD, and control signals, CTS, RTS, DSR,
DCD and DTR.