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MOXA White Paper

Expand Your Serial COMs with Optical Fiber

About MOXA

The MOXA Group manufactures one of the world’s leading brands of device networking solutions. Products include

serial boards, device servers, ready-to-run embedded computers, USB-to-serial hubs, media converters, terminal

servers, Modbus gateways, industrial switches, remote I/O servers, and Ethernet-to-fiber converters. Our

products are key components of many networking applications, including industrial automation, manufacturing,

POS, and medical treatment facilities.

How to Contact MOXA

Tel: 1-714-528-6777

Fax: 1-714-528-6778

Web: www.moxa.com

Email: inf[email protected]

This document was produced by the MOXA Technical Writing Center (TWC). Please send your comments or

suggestions about this or other MOXA documents to [email protected].

by Mr. Stephen Lin, MOXA Technologies Co., Ltd.

Note: Some of the content for this paper was contributed by Nienschanz-Automatica, Ltd.

Serial devices are used around the world as integral

components of industrial automation systems. This is due in

part to the fact that RS-232/422/485 interfaces are easy to set

up and economical to use. For example, the 2-wire RS-485

interface can be used to connect as many as 32 serial devices

to a single half-duplex line. Since the transmission distance can

be up to 1200 meters, RS-485 is suitable for many factory

applications. If more devices or greater distances are required,

RS-485 repeaters can be used to extend the 1200 meter limit

or increase the number of devices connected to the system.

Repeaters can also be used to combine several RS-485

networks into a more complex, tree-type network. However,

one of the drawbacks of using RS-485 repeaters is that each

extension is still limited to 1200 meters. Moreover, the serial

signals sent by the repeaters could be corrupted by the effects

of electromagnetic interference.

In this paper, we introduce two solutions that can be used to

overcome these problems. Both solutions use optical fiber,

since optical signals are immune to electromagnetic

interference, and the signals can be transmitted over distances

up to 40 kilometers.

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