Moxa Technologies A60, A51 User Manual
A50/A51/A60
Feb. 1997 ( 1st Edition )
All Rights Reserved
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
Copyright Notice
This documentation is copyrighted by Moxa Technologies Co., Ltd.
All rights are reserved. Moxa Technologies reserves the right to
make improvements to the products described in this manual at any
time without notice.
Information provided in this manual is intended to be accurate and
reliable. However, Moxa Technologies assumes no responsibility for
its use, nor for any infringements of rights of the fourth party which
may result from its use.
MOXA is a registered trademark of Moxa Technologies Co., Ltd.
The other trademarks in this manual belong to their manufacturers
individually.
Moxa Technologies Co., Ltd.
Tel: +866-2-8665-6373
Fax: +886-2-8665-6372
www.moxa.com.tw
support@moxa.com.tw
MoxaInternetService
s
Customer’s satisfaction is always our number one concern. To
ensure customers get the full benefit of our services, Moxa Internet
Services (MIS) have been built for technical support, product inquiry,
new driver upgrade, etc.
The followings are the services we provide.
E-mail for technical support
address : support@moxa.com.tw
Ftp site for free driver upgrade
address : ftp.moxa.com or ftp.moxa.com.tw
user ID : ftp
password : your_email_address
World Wide Web (WWW) for product info.
address : www.moxa.com or www.moxa.com.tw
Table of Contents
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
Table of Contents
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
Chapter1 Introduction
1.1 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.
RS-422/485
RJ-45 Connector
RS-232toRS-422/485
A50
onverter
C
R
R
T
P
T
X
X
W
S
D
D
RS-422/485 RS-232
R
Outlook of A50
1
Power Jack
RS-232
RJ-45 Connector
Introduction Chapter 1
IsolatedRS-232toRS-422/485
RS-422/485
RJ-45 Connector
RS-422/485 RS-232
A51
C
A51
onverter
R
R
T
X
T
X
S
D
D
P
W
R
Power Jack
RS-232
RJ-45 Connector
Outlook of A51
1.2 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,
2
Chapter 1 Introduction
150mA power adapter or the pin 6 and pin 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
v Power Supply - DC +9V to +30V, 150mA
v Data Rate - Up to 921600 bps under 500 ft (0.15 Km)
v Distance - Up to 4000 ft (1.2 Km) under 115200 bps
v RS-232 RJ-45 Connector -
Supports TxD, RxD, DTR, DSR, RTS, CTS, DCD, GND
v RS-422/RS-485 RJ-45 Connector -
Supports TxDA, TxDB, RxDA, RxDB, GND
v RS-422/RS-485 Terminal Block Connector -
Supports TxDA, TxDB, RxDA, RxDB, GND, PWR, PWR
GND
v Switch - SW1 : for full/half-duplex mode
SW2 : for Tx (driver) and Rx (receiver) state
3
Introduction Chapter 1
C
v Isolation Protection - for A51 only, up to 2000V.
v Ter minal Resistor - RT1 space reserved for RS-422/RS-485
receiver signal.
v Mounting Kit - Plastic Plates and screws for mounting
A50/A51 on the wall or any surface.
RS-232toRS-422/485
A50
onverter
R
R
T
P
T
X
X
W
S
D
D
RS-422/485 RS-232
R
Fixing Screw
A50/A51 with Mounting Kit
4
Mounting
Screw
Chapter 1 Introduction
1.3 Package Check List
Upon unpacking your A50 or A51 package, you should find the
following items:
v A50 (or A51) RS-232 to RS-422/RS-485 bidirectional
converter (with isolation protection if A51)
v One power adapter
v Mounting Kit
v A50/A51/A60 User's Manual
5
Introduction Chapter 1
6
Chapter 2 Installation
2.1 Installation Procedure
As RS-232 or RS-422/RS-485 port are labeled clearly on the
surface of the A50/A51 converter, please prepare the RS-232
cable (refer to Appendix A, RS-232 Cable Wiring) and decide
the operation mode as well as 2/4-wire cable (refer to Chapter 3,
Operation) in advance.
Take off the two screws on top of the converter and open the
cover up if you need to change the operation mode via sliding
the switches.
2.2 Switch Function Description
ON
ON
1
1 2 3 4
SW1 SW2
Inside look of A50/A51
7
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