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A50/A51/A60
Feb. 1997 ( 1st Edition )
All Rights Reserved
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Part I - A50/A51 RS-232 to RS-422/RS-485 Converter A50/A51 RS-232 to RS-422/RS-485 Bidirectional Converter
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Part II - A60 RS-232 Surge Protection A60 RS-232 Surge Protection Converter
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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 Mo
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Moxa Internet Services 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 prod
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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 an
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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
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R T S P W R R X D T X D 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 ava
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R T S P W R R X D T X D Introduction Chapter 1 Is o late dR S -232toR S -422/485 RS-422/485 A51 C onverter A51 RJ-45 Connector Power Jack RS-422/485 RS-232 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 conver
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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 -
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R T S P W R R X D T X D Introduction Chapter 1 v Isolation Protection - for A51 only, up to 2000V. v Terminal 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. R S -232toR S -422/485 Mounting Screw A50 C onverter RS-422/485 RS-232 Fixing Screw A50/A51 with Mounting Kit 4
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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
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Introduction Chapter 1 6
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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
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Chapter 2 l l Installation Switch settings table of SW1 and SW2 is as follows: SW1 *Full-duplex mode Off Half-duplex mode On SW2 Pin1 Pin2 Pin3 Pin4 *TxD always enabled On Off X X TxD always disabled Off Off X X TxD enabled by RTS Off On X X *RxD always enabled X X On Off RxD enabled by /RTS X X Off On Note: ‘ * ‘ means default settings , ‘ X ‘ means don’t care 2.3 LED Indicators There are LED indicators for TxD, RxD, RTS, and PWR on top of A50/A51. The indicator is not lighted on when not conne
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Installation l l Chapter 2 RxD indicator stands for data transmitting from RS-422/RS-485 to RS-232. It shows red when connected and no data received. It shows orange when connected and receiving data (In half- duplex mode, it shows red when line is not connected due to the characteristics of ICs for RS-485). RTS indicator is for RS-232 RTS signal. It shows red when connected and RTS signal turned on. It shows green when connected and RTS signal turned off. PWR indicator is red when power is on a
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Chapter 2 l l Installation A50/A51 A50/A51 RJ-45 Jack Terminal Block Connector Pinouts Signals Connector Pinouts Signals 1 nc 1 TxD B 2 nc 2 TxD A 3 GND 3 RxD B 4 TxD B 4 RxD A 5 TxD A 5 GND 6 RxD A 6 Power GND 7 RxD B 7 Power Input 8 GND 9 nc 10 nc(not connected) Note : Pin 6 and Pin 7 of Terminal Block are for Power GND and Power Input, which is an alternate option for power adapter. Be careful that DO NOT confuse RS-422/RS- 485 GND with Power GND. Note : Under half-duplex mode (SW1 in ON mode
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Chapter 3 Operation The A50 (or A51) supports 5 kinds of operations. They are: v Point-to-point/4-wire Full Duplex v Point-to-point/2-wire Half Duplex v Multidrop/4-wire Full Duplex v Multidrop/2-wire Half Duplex v Simplex/Transmit, Receive Only All the operations are to be described below. And TA, TB, RA and RB represent TxD A, TxD B, RxD A and RxD B signal lines of the RJ-45 RS-422/RS-485 connector or the Terminal Block, respectively. Note : If possible, connect GND of both sides together to g
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Chapter 3 l l Operation 3.1 Point-to-point Point-to-point configuration means two devices which locate at two different places can be linked together to communicate through a couple of A50 (or A51) converters. 4-wire Full Duplex A50/A51 A50/A51 TA RA DTE/ RS-232 RS-422/ TB RB RS-422/ RS-232 DTE/ DCE DCE RS-485 RB TB RS-485 RA TA GND GND In the graph, TA, TB, RA and RB could be either from RJ-45 or Terminal Block. The settings
