AXIOMTEK AX10445 Series Manuale utente

AX10445 Series

Isolated Dual Channel RS422/485

Interface Module

User’s Manual

Disclaimers

The information in this manual has been carefully checked and is

believed to be accurate. AXIOMTEK Co., Ltd. assumes no

responsibility for any infringements of patents or other rights of third

parties which may result from its use.

AXIOMTEK assumes no responsibility for any inaccuracies that may

be contained in this document. AXIOMTEK makes no commitment to

update or to keep current the information contained in this manual.

AXIOMTEK reserves the right to make improvements to this document

and/or product at any time and without notice.

No part of this document may be reproduced, stored in a retrieval

system, or transmitted, in any form or by any means, electronic,

mechanical, photocopying, recording, or otherwise, without the prior

written permission of AXIOMTEK Co., Ltd.



November 1999, Version A2

Printed in Taiwan

iii

ESD Precautions

Integrated circuits on computer boards are sensitive to static

electricity. To avoid damaging chips from electrostatic

discharge, observe the following precautions:

nDo not remove boards or integrated circuits from their anti-static

packaging until you are ready to install them.

nBefore handling a board or integrated circuit, touch an unpainted

portion of the system unit chassis for a few seconds. This helps to

discharge any static electricity on your body.

nWear a wrist-grounding strap, available from most electronic

component stores, when handling boards and components.

Unpacking

After unpacking the CPU card, check and see if the following

items are included and in good condition. If any of the items

is missing or damaged, notify your dealer immediately.

The AX10445A/A+ Isolated Dual Channel RS422/485 Interface

Module package includes the following:

nAX10445A or AX10445A+ Board

nScrew 3mm (x4)

nBronze standoffs 6mm (x4)

nAS59099 DAC Driver CD

The AX10445B/B+ Isolated Dual Channel RS422/485 Interface

Module package includes the following:

nAX10445B or AX10445B+ Board

nScrew 3mm (x4)

nBronze standoffs 6mm (x4)

nAS59099 DAC Driver CD

Make sure that all of the items listed above are present.

What To Do If There Is A Problem

If there are damaged or missing parts, contact your supplier

and/or dealer immediately. Do not attempt to apply power to

the board if there is damage to any of its components.

Trademarks Acknowledgments

AXIOMTEK is a trademark of AXIOMTEK Co., Ltd.

IBM is a registered trademark of International Business

Machines Corporation.

MS-DOS, Microsoft C and QuickBasic are trademarks of

Microsoft Corporation.

TURBO C is a trademark of Borland Inc.

BASIC is a trademark of Dartmouth College.

Intel is a trademark of Intel Corporation.

Other brand names and trademarks are the properties and

registered brands of their respective owners.

Table of Contents

T a b l e o f C o n t e n t s

Chapter 1 Introduction

1.1 General Description .........................................1

1.2 Features..........................................................2

1.3 Specifications..................................................3

Chapter 2 Setting up the AX10445

2.1 Installing the AX10445 ......................................5

2.2 DIP Switches (Base Address Selection) ..............6

2.3 Jumper Settings...............................................7

2.3.1 JP9 (IRQ Level Selection)...................................7

2.3.2 JP5, JP8 (RS422/485 mode selection) ...............8

2.3.3 JP1 & JP2, JP3 & JP4 (Bypass protection

resistors).........................................................................8

2.3.4 JP6 & JP7 (Enable/Disable)................................9

2.4 Pin Assignments............................................. 10

2.5 Signal Wirings............................................... 12

Chapter 3 Technical Reference

3.1 UART Register Description .............................. 13

3.2 About EIA RS-422/485...................................... 17

3.3 Driver and Receiver Circuit............................. 19

3.3.1 Driver Detail......................................................19

3.3.2 Receiver Detail.................................................19

3.4 Isolation Circuit (for AX10445A) ....................... 20

3.5 Termination Resistor ...................................... 20

3.6 Surge Absorber..............................................xx

Table of Contents

Chapter 4 Application

4.1 General......................................................... 21

4.2 Demo Program for QB4.5.................................22

4.3 Demo Program for Turbo Pascal...................... 24

4.4 Demo Program for TC for User to Communicate

with Remote Device........................................ 27

Appendix A AX10445A Location Diagram

Appendix B AX10445B Location Diagram

Appendix C Block Diagram

Appendix D PC I/O Address Map

Appendix E PC IRQ Map

Appendix F PC/104 Mechanical

Specifications

General Description ................................................ 45

Module Dimensions................................................. 45

AX10445 Module Series User’s Manual

Introduction 1

C h a p t e r 1

Introduction

1.1 General Description

The AX10445, a dual channel asynchronous serial

communication with two RS-422/485 serial interfaces, is a

PC/104 form-factor universal PC/104 bus module that plugs

directly into PC/104 carrier module. The AX10445 Series

permits higher data rates and longer cable lengths of

asynchronous communications than RS-232 do. Complete

with this AX10445, your PC can communicate with other

computers or devices having the same communication

parameters and interface (through the two 9-pin D-type

connectors on the right edge of this module). For protection

against electrical surges, at both channels, there are onboard

varistors connected between each of the differential

communication wire lines.

AX10445 Module Series User’s Manual

Introduction

You could fully integrate your PC with the AX10445 Series by

simply plugging it in a PC/104 expansion bus. If the two

standard serial ports (COM1 and COM2) are used, then no

certain control code will be needed for AX10445.

RS-422 and RS-485 use differential signal lines that decrease

noise effect in data transmission. RS-422 is a unipolarity

differential protocol good to 10M baud and to 4000 feet. RS-

485 is similar to RS-422, but with additional specifications so

that many drivers and receivers can share a single line. Thus,

the feature of RS-422 is one driver to multiple receivers while

RS-485’s is several drivers to multiple receivers’multi-drop

communication.

You may assign your board to either RS-422 or RS-485 type

of transmission via JP5. Please refer to Chapter 2 for the

proper jumper settings.

1.2 Features

lTwo independent EIA RS-422/485 interface

lReliable communication up to 4000 feet (1.2KM)

at 100K bps

lIBM compatible serial ports up to 56000 BAUD

rates

lSelectable UART port address from hex 200 to

3F8

lJumper selectable interrupt level IRQ 3, 4, 5, 7,

10, 11, 12

lSupports TX, RX, RTS and CTS signals

lTwo or four wire operation

lRS-485 transmitter enable jumper operations:

always enable and RTS enable

lOnboard termination resistors space

lOnboard surge absorbers space

lFully isolated input and output for AX10445A

lOnboard TX, RX LED indicators

AX10445 Module Series User’s Manual

Introduction 3

1.3 Specifications

lDimension: 95mm (3.74inch) X 90mm

lBaud rate: 50 –56,000bps

lClock input: 1.8432MHz

lInterrupt level: IRQ 3, 4, 5, 7, 10, 11, 12

lI/O connection: Dual 9-pin D type male

connectors

lTransmitter:

nDevice: SN75172 or equivalent

nHigh level voltage: 3.7V typical at 33mA source

nLow level voltage: 1.1V typical at 33mA source

nHigh level current: 60mA source max

nLow level current: 60mA sink max

lReceiver:

nDevice: SN75173 or equivalent

nDifferential input threshold:0.2V max

nHysteresis: 50mA typical

nInput impedance: >12K Ohm with out terminators

lPower Consumption:

n+5V, 500mA typical for AX10445A

n300mA typical for AX10445B

AX10445 Module Series User’s Manual

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