Moxa Technologies A50 User manual

A50/A51/A60

Dec. 1999 ( 2nd Edition )

Part I -A50/A51 RS-232 to RS-422/RS-485 Converter

A50/A51

RS-232 to RS-422/RS-485

Bidirectional Converter

Part II -A60 RS-232 Surge Protection

A60

RS-232 Surge Protection

Converter

A50/51/60User’sManual

The product described in this manual is furnished under a license agreement and may be

used only in accordance with the terms of the agreements.

Reproduction in any form without permission is prohibited.

Trademarks

MOXA is a registered trademark of Moxa Technologies Co., Ltd.

All other trademarks or registered marks in this manual belong to their respective manufacturers.

Disclaimer

Information in this document is subject to change without notice and does not represent a commitment on

the part of Moxa.

Moxa provides this document “as is”, without warranty of any kind, either expressed or implied,

including, but not limited to, the particular purpose. Moxa may make improvements and/or changes in

this manual or in the product(s) and/or the program(s) described in this manual at any time.

Information provided in this manual is intended to be accurate andreliable. However, Moxa Technologies

assumes no responsibility for its use, or for any infringements of rights of the fourth parties which may

result from its use.

This product could include technical or typographical errors. Changes are periodically made to the

information herein; these changes may be incorporated in new editions of the publication.

MOXAInternetServices

Customer’s satisfaction is always our number one concern. To ensure that customers get the full benefit

of our services, Moxa Internet Services have been built for technical support, product inquiry, new driver

update, user’s manual update, etc.

The followings are the services we provide.

E-mail for technical support

address:[email protected]

FTP site for free driver update

address: ftp.moxa.com

ftp.moxa.com.tw

user ID: ftp

password: your_email_address

World Wide Web (WWW) Site for product info

address: www.moxa.com

www.moxa.com.tw

TableOfContents

Part I -A50/A51 RS-232 to RS-422/RS-485 Converter

Chapter 1. Introduction ………………………………………. 1

1.1 Overview 1

1.2 Features and Specifications 2

1.3 Package Check List 5

Chapter 2. Installation ……………………………………….. 7

2.1 Installation Procedure 7

2.2 Switch Function Description 7

2.3 LED Indicators 8

2.4 RS-422/RS-485 Pinouts 9

Chapter 3. Operation ………………………………………… 11

3.1 Point-to-point 12

3.2 Multidrop 14

3.3 Simplex/Transmit, Receive 17

3.4 Self Test 19

Appendix A RS-232 Pinouts and Cable Wiring ……………….. 21

Appendix B Impedance Matching and Termination Resistors…… 25

Appendix C Troubleshooting …………………………………. 27

TableOfContents

Part II -A60 RS-232 Surge Protection

Chapter 1. Introduction…………………………………………… 29

1.1 Overview 30

1.2 Features and Specifications 30

1.3 Package Check List 31

Chapter 2. Installation……………………………………………… 33

2.1 Installation Procedure 33

2.2 LED Indicators 34

2.3 Self Test 36

Appendix A RS-232 Pinouts and Cable Wiring…………………… 37

Appendix B Troubleshooting ……………………………………….. 41

11-1

Introduction

Overview

The MOXA RS-232 to RS-422/RS-485 bidirectional converters, A50 and A51, are

designed to convert unbalanced (single-ended) RS-232 signals to balanced

(differential) RS-422/RS-485 signals, and vice versa. They are the best choices for

those who want to control devices at longer distance and/or to communicate with

several devices via merely one link, particularly in the industry area. Point-to-point,

multidrop and simplex operations are available for most users' needs.

Outlook of A50

RS-422/485

RJ-45 Connector

Power Jack

RS-232

RJ-45 Connector

1-2

Outlook of A51

Features and Specifications

Features

Both A50 and A51 are RS-232 to RS-422/RS-485 bidirectional converters except

that A51 has one more feature: isolation protection, which provides high voltage

protection up to 2000V.

All the switches, SW1 and SW2, of A50/A51 are designed to be inside of the

converter to protect switch settings from unintended change and introducing

communication error without any warning. Hence, it is necessary to take the two

screws off and open the cover up if you need to change the operation mode via

sliding the switches.

The A50/A51 must be powered either from a DC +9V to +30V,

150mA power adapter or the pin 6 andpin 7 of the Terminal Block.

LED indicators are provided to show the status of data transmitting/receiving, RTS

signal and Power.

To avoid over-current from the remote ground to converter's ground, an protect

resistor has been added inside the A50/A51.

Specifications

vPower Supply -DC +9V to +30V, 150mA

vData Rate -Up to 921600 bps under 500 ft (0.15 Km)

vDistance -Up to 4000 ft (1.2 Km) under 115200 bps

vRS-232 RJ-45 Connector -

Supports TxD, RxD, DTR, DSR, RTS, CTS, DCD, GND

vRS-422/RS-485 RJ-45 Connector -

RS-422/485

RJ-45 Connector

Power Jack

RS-232

RJ-45 Connector

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