Advantech PCL-720 User manual

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Model PCL-720

Digital I/O &

Counter Card

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PCL-720 Digital I/O and Counter Card

USER'S MANUAL

Thisdocumentationiscopyrighted1990byAdvantech

Co., Ltd. All rights are reserved. Advantech Co., Ltd.

Reserves the right to make improvements in the

products described in this manual at any time without

notice.

No part of this manual may be reproduced, copied,

translated or transmitted, in any form or by any means

withoutthe prior writtenpermissionofAdvantechCo.,

Ltd. Information provided in this manual is intended to

be accurate and reliable. However, Advantech Co.,

Ltd. assumes no responsibility for its use; nor for any

infringements of rights of third parties which may

result from its use.

PC-LabCard isa trademark of Advantech Co., Ltd. IBM

and PC are trademarks of international Business

Machines Corporation. MS-DOS is a trade mark of

Microsoft Corporation. BASIC is a trademark of

Dartmouth College. Intel is a trademark of Intel

Corporation.

Part No. 2003720000 Rev. C1

Printed in Taiwan Mar. 1990

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TABLE OF CONTENTS

CHAPTER 1 GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . 1

1.1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.2. Features, Application and Specifications . . . . . . . . . . . . . . 1

CHAPTER 2 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.1. Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2. Base Address Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.3. Clock Frequency Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.4. Installing into the PC . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . 7

CHAPTER 3 SIGNAL CONNECTION . . . . . . . . . . . . . . . . . . . . . . . 9

3.1. Connector Pin Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.2. Timer/Counter Signal Pads . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.3. Clock Source Pads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.4. Strobe of Digital Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

CHAPTER 4 PROGRAMMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.1. Register Structure and Format . . . . . . . . . . . . . . . . . . . . . . . . 13

4.2. Digital UO Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.3. Programmable Interval Timer . . . . . . . . . . . . . . . . . . . . . . . . 15

4.3.1. The Intel 8253 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.3.2. The Control Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.3.3. Mode Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.3.4. Loading and Reading The Counters . . . . . . . . . . . 20

APPENDIX A I/O PORTADDRESS MAP . . . . . . . . . . . . . . . . . . . . . 23

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CHAPTER 1 GENERAL INFORMATION

1.1. Introduction

The PCL-720 Digital I/O and Counter Card is a PC add-on card that offers you

32 digital input channels, 32 digital output channels and 3 counter/timer

channels. All digital input and output channels are TTL/DTL compatible.

Each digital input or output channel corresponds to a certain bit of the I/O port

of the PC and it is very easy to program the function of this card.

To make your application easier, external daughter boards, PCLD-782, PCLD-

785 and PCLD-786, are designed to work with the digital input/output ports of

the PCL-720. The PCLD-782 is a 16-channel opto-isolated digital input board

which provides an easy way to input digital data to the PCL-720 when the

ground isolation is required The PCLD-785 is a 16-channel relay output board

which can be driven by the digital output of the PCL-720 card. The PCLD-786

is an SSR board which can control AC power up to8 channels.

An on-board Intel 8253 programmable interval timer provides three independent

16 bit down counters as timing sources for various applications. Also, a

breadboard area is available for customized interface circuits.

The PCL-720 (after rev. C) also offers on-board clock sources those are 1 MHz,

100 KHz and 10 KHz and these frequencies can be double, half or quartered by

setting jumpers.

1.2 Features, Application and Specifications

Features :

Ÿ32 digital input channels

Ÿ32 digital output channels

ŸHigh output driving capacity

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General Information PCL-720

ŸLowinput loading

Ÿ3-channelprogrammable intervaltimer

ŸOn-board crystalbased clocksource

ŸBreadboard area forcustomized circuits

Applications

ŸIndustrialON/OFF control

ŸContact closure monitoring

ŸSwitch panel status sense

ŸBCD interface

ŸDigital I/O control

ŸIndustrial automation

ŸLaboratory automation

ŸPeriod and pulse width measurement

ŸEvent and frequency counting

Specifications

ŸDimensions: 9" x 4.125"

22.8 cm x 10.48 cm

ŸBus : IBM PC bus

ŸSlot : One 62-pin slot

ŸI/O Port Address : Hex 200 - hex 3F8

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PCL-720 General Information

ŸBreadboard Area: 540 (30 X 18) plated-through "donuts"

holes, each with a.036' hole on 0.10"

centers.

ŸDigital Input

Input Low Level : Min. -0.5V, max. 0.8V

Input High Level: Min. 2.0V, max. 5.0V

Input Loading : Max 0.2 mA at 0.4V

Input Hysteresis : Typical 0.4V, min. 0.2V

ŸDigital Output

Output Low Level : Max. 0.5V at 24 mA

(sink) Max. 0.4V at 12 mA

Output High Level : Min. 2.0V at 15 mA

(source) Min. 2.4V at 3 mA

Driving Capacity : 15 TTL's at least

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CHAPTER 2 INSTALLATION

2.1. Initial Inspection

Inside the shipping container, you should find this operating manual and the

PCL-720 card.

The PCL-720 is carefully inspected both mechanically and electrically before

shipment. It should be free of marks and scratches and in perfect electrical

order on receipt.

Remove the PCL720 interface card from its protective packaging by grasping

the metal rear panel. Keep the anti-vibration package since it may be used to

return the card if it needs repair. The package may also be used if the card is

stored outside of the computer.

The board should be handled only by the edges. The integrated circuits on

the board can be damaged by static electric discharge. The package

2.2. Base Address Selection

Most of the peripheral devices and the interface adapters in the PC are

controlled and sensed using the digital input and output pens. These ports are

addressed using the I/O port address space of the 8088 or 80286

microcomputer.

The I/O port base address for the PCL-720 is selectable by the setting of a DIP

switch (SW1). Valid addresses are from hex 200 to hex 3F8. Refer to Figure

2.1 for the location of the DIP switch (SW1).

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Installation PCL-720

Figure 2.1 The PCL-720 Card

The required switch settings for various base addresses are illustrated

as below :

Note : - ON=0, OFF=1

- "X" means "don't care"

- 1..8 are switch positions

- A3..A8 correspond to address Lines of the PC bus. A9 is

hard-wired to be 1.

- * means factory setting

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PCL-720 Installation

---------------------------------------------

I/o port Switch position

address 1 2 3 4 5 6

(Hex) A8 A7 A6 A5 A4 A3

---------------------------------------------

200-207 0 0 0 0 0 0

208-20F 0 0 0 0 0 1

* 2A0-2A7 0 1 0 1 0 0

2A8-2AF 0 1 0 1 0 1

2E8-2EF 0 1 1 1 0 1

2F8-2FF 0 1 1 1 1 1

3E8-3EF 1 1 1 1 0 1

3F8-3FF 1 1 1 1 1 1

---------------------------------------------

2.3. Clock Frequency Setting

The PCL-720 offers on-board clock sources those are 1 MHz, 100 KHz and 10

KHz when a jumper is placed on the position marked "xl" of JP1. These

frequencies can be double, half or quartered by placing a jumper on position

"x2", "x1/2" or "xl/4" of the JP1. For example, a frequency source of 25 KHz

can be got from the pad marked "100K" when placing the jumper on position

"x1/4" of the JP1 as below.

oo x2

* oo xl * : Factory setting

oo x1/2

oo x1/4

JP1

2.4. Installing into the PC

POWERMUSTALWAYSBESWITCHEDOFFwhenremovingorinsertingthe

PCL-720 card and connecting or disconnecting cables.

Use a screw driver to remove the cover mounting screws from the rear of the

system unit.

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