Advantech PCL-833 Manual de usuario
PCL-833
3-axis quadrature encoder
and counter card
Copyright
This documentation and the software routines contained in the PCL-
833 software disk are copyrighted 1994 by Advantech 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 without the prior written
permission of Advantech Co., 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 infringe-
ments of the rights of third parties which may result from its use.
Acknowledgments
PC-LabCard is a trademark of Advantech Co., Ltd. IBM and PC are
trademarks of International Business Machines Corporation. MS-
DOS, Microsoft C and Quick Basic are trademarks of Microsoft
Corporation. BASIC is a trademark of Dartmouth College. Intel is a
trademark of Intel Corporation. Turbo C is a trademark of Borland
International.
Part No. 2005833000 1st Edition
Printed in Taiwan June 1994
Contents
Chapter 1 General information....................................... 1
Introduction........................................................................... 2
Encoder interface ...........................................................................2
Counters .........................................................................................2
Digital input and interrupts ............................................................2
Features.................................................................................. 3
Applications ........................................................................... 3
Specifications......................................................................... 4
Encoder input .................................................................................4
Digital input ...................................................................................4
Programmable interrupt controller ................................................4
General ...........................................................................................4
Block diagram ....................................................................... 5
Chapter 2 Installation....................................................... 7
Initial inspection.................................................................... 8
Switch and jumper settings.................................................. 8
Base I/O address (SW1).................................................................8
Interrupt level (JP1) .......................................................................9
Connector pin assignments ................................................ 11
Connector wiring .........................................................................12
Hardware installation......................................................... 13
Software installation ........................................................... 14
Chapter 3 Operation ....................................................... 1 5
Quadrature encoder introduction ..................................... 16
Counter modes .................................................................... 17
Digital noise filter ................................................................ 18
Latch mode .......................................................................... 19
Counter reset value ............................................................. 20
Reset after latch .................................................................. 20
Cascade mode ...................................................................... 20
Timer function..................................................................... 21
Interrupt function ............................................................... 22
Chapter 4 Programming ................................................ 2 3
Driver programs.................................................................. 24
Basic program structure..................................................... 24
Driver functions .................................................................. 25
Write functions ............................................................................25
Read functions .............................................................................28
Compiling and linking with C compilers.......................... 28
Borland C .....................................................................................28
Microsoft C ..................................................................................29
Chapter 5 Register structure and format................... 3 1
Register format (read) ........................................................ 32
Register format (write) ....................................................... 34
Appendix A 8259A Data Sheet....................................... 3 9
Chapter 1 General information 1
CHAPTER
1
General information
2PCL-833 User's Manual
Introduction
The PCL-833 is a 3-axis quadrature encoder and counter add-on card
for the IBM PC/AT and compatibles (ISA bus). This card lets your PC
perform position monitoring for motion control systems. It provides
three 24-bit up/down counters as quadrature encoders and a 16-MHz
oscillator timebase with wide-range multiplier. An on-board interrupt
controller handles nine different interrupt sources.
Encoder interface
Each input includes a decoding circuit for incremental quadrature
encoding. Inputs accept either single-ended or differential signals.
Quadrature input works with or without an index, allowing linear or
rotary encoder feedback.
Counters
The PCL-833 has three independent 24-bit counters. The maximum
quadrature input rate is 1.0 MHz, while the maximum input rate in
counter mode is 2.4 MHz.You can individually configure each
counter for quadrature decoding, pulse/direction counting or up/down
counting.
Digital input and interrupts
The PCL-833 provides five digital input channels. The channels
accept digital input as an index input for a rotary encoder or as a home
sensor input for a linear encoder.
The card can generate an interrupt to the system based on a signal
from its digital inputs, overflow/underflow of its counters or on a
programmed time interval. It can repeatedly generate interrupts at any
time interval you specify, 0.1 msec to 255 sec. These interrupts let you
precisely monitor the speed of a control system.
Chapter 1 General information 3
Features
• Three 24-bit up/down counters (cascade for up to 48 bits)
• 1.0 MHz max quadrature input rate
• 2.4 MHz max. input pulse rate
• Single ended or differential inputs
• Pulse/direction and up/down counter
• X1, X2, X4 counts for each encoder cycle
• Optically isolated up to 2500 V
• 4-stage digital filter with selectable sampling rate
• 16-MHz oscillator timebase with wide-range multiplier
• On-board interrupt controller with nine different interrupt sources
• Digital input with interrupt for each axis
• Programmable time interval interrupt
• Half-sizeAT-bus card
Applications
• Motion control
• Position sensing, monitoring and measuring
• Coordinate measuring machines
• X-Y table monitors
• Robotics
• Machine control
4PCL-833 User's Manual
Specifications
Encoder input
•No. of Axes: Three independent axes
•Max. quadrature input freq.: 1.0 MHz
•Max. input pulse freq.: 2.4 MHz
•Counts per encoder cycle: 1, 2 or 4 (s/w selectable)
•Encoder type: Single-ended or differential
•Counter size: 24 bits, easily daisychains for up to 48 bits
•Counter modes:
Quadrature, up/down, count/direction (s/w selectable)
•Digital filter: 4 stage
•Sample clock freq.: 8, 4 or 2 MHz (s/w selectable)
•Input isolation: 2500 VRMS using optical isolators
Digital input
•No. of channels: five differential, with interrupt
•Input isolation: 2500 VRMS using optical isolators
Programmable interrupt controller
10-Hz, 1-KHz or 10-KHz time base (s/w selected) with a programma-
ble multiplier from 1 to 255
General
•Connector: DB-25
•Board dimensions: 185 mm x 100 mm
Chapter 1 General information 5
Block diagram
CONTROL UNIT
ADDRESS
DECODER
ADDRESS, DATA AND CONTROL BUS BUFFER
INTERRUPT
CONTROLLER
PROGRAMMABLE
TIME-BASE
GENERATOR
DIFF/SE ISOLATION INPUT CIRCUIT
CH.1 PHASE A
CH.1 PHASE B
CH.1 INDEX
CH.2 PHASE A
CH.2 PHASE B
CH.2 INDEX
CH.3 PHASE A
CH.3 PHASE B
CH.3 INDEX
D/I CH. 0
D/I CH. 1
COUNTER
MODE
CONTROL
DIGITAL
FILTER
24-BIT
UP/DOWN
COUNTER
24-BIT MUTI-MODE
UP/DOWN COUNTER
24-BIT MUTI-MODE
UP/DOWN COUNTER
PC BUS
CONTROL AND DATA BUS
6PCL-833 User's Manual
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