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P10-12 User's Guide

Revision D - April 1994

Part Number: 64190

The information contained in this manual is believed to be accurate and reliable. However, Keithley

Instruments, Inc., assumes no responsibility for its use or for any infringements of patents or other rights

of third parties that may result from its use. No license is granted by implication or otherwise under any

patent rights of Keithley Instruments, Inc.

KEITHLEY INSTRUMENTS, INC., SHALL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL,

OR CONSEQUENTIAL DAMAGES RELATED TO THE USE OF THIS PRODUCT. THIS

PRODUCT IS NOT DESIGNED WITH COMPONENTS OF A LEVEL OF RELIABILITY

SUITABLE FOR USE IN LIFE SUPPORT OR CRITICAL APPLICATIONS.

Refer to your Keithley Instruments license agreement and Conditions of Sale document for specific

warranty and liability information.

MetraByte is a trademark of Keithley Instruments, Inc. All other brand and product names are

trademarks or registered trademarks of their respective companies.

0Copyright Keithley Instruments, Inc., 1991, 1993, 1994.

by Section 117 of the 1976 United States Copyright Act without permission of the Copyright owner is

unlawful.

Keithley MetraByte Division

Keithley Instruments, Inc.

440 Myles Standish Blvd. Taunton, MA 02780

Telephone: (508) 880-3000 • FAX: (508) 880-0179

Table of Contents

Preface

1Overview

General Description 1-1

Features and Operating Characteristics 1-2

Accessories 1-2

2Installation

Unpacking and Inspecting 2-1

Setting the Switches and Jumpers 2-2

Setting the Base Address2-3

Setting the J8 Slot/Wait State Switch 2-4

Configuring the Interrupt Level 2-4

Installing the Board 2-5

Using Power from the PIO-122-6

3Cabling and Wiring

Attaching Accessories 3-2

Attaching an STC-37 Accessory 3-3

4Programming

Port Configuration 4-2

Programming Examples4-5

Writing the Control Register4-5

Basic I/0 Operations4-5

Reading BCD Data4-5

Bit Operations4-5

Programming Notes4-6

Interpreted Basic4-6

I/O Commands 4-6

PIO-12 Interrupt Channel 4-7

Assembly Language 4-7

iii

5Troubleshooting

Problem Isolation 5-1

Identifying Symptoms and Possible Causes5-1

Tes ti ng the Board and Host Computer 5-3

Tes ti ng the Accessory Slot and I/O Connections 5-4

Tec hn ic al Support 5-5

Figure 1-1. Block Diagram of the PIO-12 1-1

Figure 2-1. Switch and Jumper Locations 2-2

Figure 3-1. Pin Assignments for the Main I/O Connector . . . . 3-1

Figure 3-2. Attaching Accessories through a C-1800 or

S-1800 Cable 3-2

Figure 3-3. Layout of STC-37 Screw Terminal

Connector Panel 3-3

Figure 3-4. Attaching an STC-37 Accessory 3-4

Figure B-1. Main I/O Connector Pin Assignments B-1

List of Tables

Tab le 2-1. Values of Base Address Switch Positions 2-3

Tab le 2-2. Standard Address Assignments 2-3

Tab le 2-3. Standard Interrupt Usage 2-5

Tab le 4-1. 8255 PPI Address Map 4-2

Tab le 4-2. Derivation of Port Configuration from

Control Word 4-3

Tab le 4-3. PIO Control Word 4-4

Tab le 5-1. Troubleshooting Information 5-2

Table A-1 Input and Output Specifications A-1

Tab le A-2 Environmental Specifications A-2

ASpecifications

BConnector Pin Assignments

Index

List of Figures

Preface

The P10-12 User's Guide describes how to set up, install, and program

the P10-12 digital I/O interface board.

This guide serves data acquisition system designers, engineers,

programmers, and other users responsible for setting up, cabling and

wiring signals to P10-12 boards in an IBM® PC/XTTM, PC AT®, or

compatible computer. Users are assumed to be familiar with data

acquisition principles, with their application, and with the programming

language used with the P10-12.

The P10-12 User's Guide is organized as follows:

•Chapter 1 provides an overview of the hardware, a block diagram,

and a description of P10-12 features.

•Chapter 2 describes how to inspect, set up, and install the board.

•Chapter 3 describes how to connect accessories and wire applications

to the board.

•Chapter 4 describes programming requirements of the board.

•Chapter 5 describes common problems and solutions, troubleshooting

procedures, and how to obtain technical support.

•Appendix A contains PIO-12 specifications.

•Appendix B contains pin assignments for the main connector of the

PIO-12 board.

■

-0

A9 r

Address

Decoder

Address

Selector

10R/ I Switch

IOW/ r

IRQ21 o

ti I I o

Interrupt

Level

Selector

IRQ71

Overview

General Description

The P10-12 is a 24-line, parallel, digital I/O interface board for

IBM PC/XT, PC AT, and compatible computers. This board provides a

flexible interface for a variety of parallel I/O devices, including

instruments, displays and user-assembled systems. Figure 1-1 shows a

block diagram of the P10-12.

PC Bus

Data Bus

Buffer

01,

8255

PP I

Rear Connector

>PA I

Interrupt Input

IInterrupt Enable

+5 V

I-5 V

+12 V

-12 V

Common

Figure 1-1. Block Diagram of the P10-12

1-1

Features and Operating Characteristics

P10-12 features and operating characteristics are described as follows:

•The PIO-12 has three TTL/CMOS-compatible, digital I/O ports: port

A, port B, and port C. Ports A and B are both byte-wide (8-bits) and

can be inputs or outputs. Port C is also byte-wide but is configurable

as two separate 4-bit ports (port C Lower and port C Upper), each of

which can be an input or output.

•The P10-12 has an interrupt input channel with a corresponding

interrupt-enable line. A PIO-12 interrupt can be directed to any of six

interrupt levels available on the PC bus.

•The P10-12 features its own enable line, which can be tri-stated

(interrupt enable - active low). The 8259 Interrupt Controller of the

computer handles interrupts and is set by the computer BIOS to

respond to positive-edge-triggered (low-high) inputs. You must

program the 8259 to respond to your application's requirements by

setting up the corresponding interrupt handlers.

•The P10-12 performs 10-bit I/O address decodes and communicates

with the PC Bus as an 8-bit peripheral. The address map uses four

consecutive I/0 addresses. Multiple P10-12 boards can be installed in

acomputer at different base addresses.

•Power levels of +5 V, -5 V, +12 V, and -12 V from the computer are

available through the main I/0 connector of the P10-12. If you plan to

use power from the PC, you should consider the power draw of all

system devices and observe current-capacity limits of the computer.

Accessories

The following accessories are available for use with P10-12 boards.

•STA-U - screw terminal accessory. This accessory connects to the

main I/0 connector of the P10-12 through a C-1800 cable to make all

1/0 signals accessible through labeled screw terminals.

1-2 Overview

• STC-37 -screw terminal connector panel. This accessory connects

directly the the main I/O connector of the P10-12 to provide

general-purpose screw-terminal connections in a compact form

factor.

• SSIO-24 -24-channel mounting panel for up to 24 solid-state,

miniature I/O modules with functions of DC input, DC output, AC

input, and AC output. The SSIO-24 connects to the main 1/0

connector of the PIO-12 through a C-1800 cable.

• SRA-01 -8-channel mounting panel for up to eight solid-state,

miniature I/O modules. The SRA-01 connects to the main 1/0

connector of the P10-12 through a C-1800 cable.

• ERB-24 -electrical relay board. This accessory provides 24

electromechanical double-pole, double-throw relays for controlling

and switching up to 3 A at 120 ViThs. The ERB-24 connects to the

main 1/0 connector of the P10-24 through a C-1800 cable.

• ERA-01 - electrical relay accessory containing eight single-pole,

double-throw relays that can switch up to 3 A at 120 Vrms.

• C-1800 -cable. The C-1800 is an 18-inch ribbon cable terminated at

both ends with 37-pin D-type connectors.

• S-1800 -cable. The S-1800 is a shielded version of the C-1800.

Refer to Chapter 4 for cable connections for these accessories.

1-3

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