Moxa TCC-100-T User's Guide download pdf (Page 5)

Moxa TCC-100 Series User’s Guide

Overview

Introduction

Many important devices used in today’s industrial environment are still designed

for use with an RS-232 interface. The reason is due in part to tradition, and in part

to convenience. RS-232 hardware is relatively easy to design, and the device can

be readily connected to most PCs. The drawback is that RS-232 is a point-to-point

interface, and it imposes a distance limitation of only 15 meters between the

device and the computer.

To overcome these limitations, many users employ RS-232 to RS-422/485

converters, allowing RS-232 devices to connect to an industrial RS-422 or

RS-485 network and transmit data over distances up to 1.2 km. The RS-422/485

standards overcome the distance limitation by using a differential signal for

transmitting data and control signals. Transmission distance and multi-drop

connections are not the only issues of importance for industrial applications In

addition, housing, wiring, power supply, and over-surge protection are also

serious concerns.

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Moxa TCC-100-T User's Guide Page 5