COMT 366 Series

CyberResearch® Serial Communications

3.0 Installation

The COMT 366 is designed to interface EIA-232 with RS-485 equipment. The EIA-232 device can be either a DTE or DCE type device. The DTE/DCE selector switch allows for reversing Pins 2 and 3 ( TD and RD), thereby eliminating the need for null modem cables. If the switch is in the DTE position, Pin 2 of the RS-232 connector is an output for the COMT 366.

The half-duplex nature of RS-485 allows for a Master-Slave configuration. In a network, the master will poll the slaves through the single twisted pair and request that only one device access the line at a time.

The COMT 366 can operate at the following Baud rate/distance combinations:

Baud rate:

38.4 K

19.2K

9.6K and below

Distance (ft.)

4000

6000

18000

Two pairs of screw terminals are provided to allow the pass through of the twisted pair. This simplifies installation of a network. There are internal connections between both positive and both negative terminals.

The COMT 366 can be interfaced to the network bus in two configurations. However, the results of both configurations are identical. The first configuration allows for a direct splice into the bus. The second configuration creates a "T" at the bus and runs a stub of wire to the unit.

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