Hardware reference guide

Modbus Plus NOM
300
35013379 02 October 2007
Fiber Optic Cable
Connections
The NOM25200 module is connected in the Quantum system by a fiber optic cable
(see the following figure). The cable has two strands. Each module transmits a
signal in one direction. For this reason, each strand must be connected to the
transmit port on one module and the receive port on the other.
One strand of the fiber optic cable is labelled every 10 inches with the
manufacturer’s name and the cable specifications. This is the only way to distinguish
the two strands.
Module A
Module B
Transmit Transmit
Fiber
Port2
Fiber
Port2
Receive Receive
Receive
Receive
Fiber
Port1
Fiber
Port1
From Previous
NOM Transmit
From Previous
NOM Receive
To Next
NOM Receive
To Next
NOM Transmit
Transmit Transmit
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com