User`s manual

Contents
CHAPTER 1 General Information ......................... 1
1.1 Introduction ........................................................... 2
1.2 Features.................................................................. 4
1.3 Applications ........................................................... 4
1.4 Specifications....................................................... 5
1.5 Pin Assignments..................................................... 6
1.6 Block Diagram ....................................................... 7
CHAPTER 2 Installation ......................................... 9
2.1 Initial Inspection ................................................... 10
2.2 Unpacking ............................................................ 10
2.3 Jumper Settings .....................................................11
2.4 Installation Instructions ........................................ 14
CHAPTER 3 Operation ......................................... 17
3.1 Overview .............................................................. 18
3.2 Digital I/O Ports ................................................... 18
3.2.1 Introduction ........................................................................................... 18
3.2.2 8255 Mode 0 .......................................................................................... 18
3.2.3 Input/Output Control ............................................................................ 19
3.2.4 Initial Configuration ............................................................................... 19
3.2.5 Dry Contact Support for Digital Input ................................................. 20
3.3 Interrupt Functions............................................... 21
3.3.1 Introduction ........................................................................................... 21
3.3.2 IRQ Level ...............................................................................................21