I/O Programming Toolkit

Table of Contents

• 1 Introduction
  • 1.1 Release Notes
• 2 I/O Subsystem Overview
  • 2.1 Starting and Stopping the I/O Subsystem
    • 2.1.1 The drvup Program
    • 2.1.2 The drvdown Process
  • 2.2 Local I/O Data Flow
    • 2.2.1 Startup & Polling
    • 2.2.2 Demand Scans, Outputs, and Commands
    • 2.2.3 Shutdown
  • 2.3 Remote I/O Data Flow
    • 2.3.1 Startup & Polling
    • 2.3.2 Demand Scans, Outputs, and Commands
    • 2.3.3 Shutdown
  • 2.4 More About the Distributed I/O Subsystem
• 3 Virtual Devices
  • 3.1 The Virtual Device Data Base
  • 3.2 Aliased Drivers
    • 3.2.1 Configuring Alias Drivers
    • 3.2.2 Outputs to Alias Drivers
  • 3.3 Supported Data Types
  • 3.4 Device Driver Control Block
• 4 Interprocess Communications
  • 4.1 Sending Data to AccessPoint
  • 4.2 Receiving Driver Commands
  • 4.3 Toolkit Driver Commands
  • 4.4 Sending Commands to the Driver
  • 4.5 Custom Driver Commands
    • 4.5.1 Defining a Custom Driver Command
    • 4.5.2 Sending a Custom Command
  • 4.6 Handling Driver Commands
  • 4.7 Byte-Swapping
• 5 Scheduling Driver Tasks
• 6 IODD Routines Reference
• 7 Communications Statistics
• 8 Deadbanding
  • 8.1 Important Note
• 9 Data Quality Flags
• 10 Log Status Interface
• 11 I/O Programming Toolkit Contents
• 12 Driver Configuration
  • 12.1 Example iodevices.dat File
  • 12.2 Device Specific File Format
  • 12.3 Example Device Specific File
  • 12.4 Field Descriptions
  • 12.5 CC Fields
  • 12.6 IOB Fields
  • 12.7 DAT Fields
• 13 The Make System and the Driver
• 14 Steps to Produce a Driver
• 15 Porting Old Drivers
  • 15.1 Data Quality Flags
  • 15.2 Time Stamps