ADLINK Technology NuDAQ ACL-8454 User manual

NuDAQ

ACL-8454
MultiFunctions
Counter / Timer Card
User’s Guide

@Copyright 1997~2000 ADLINK Technology Inc.
All Rights Reserved.
Manual Rev. 1.22: April 15, 2000
The information in this document is subject to change without
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does not represent a commitment on the part of the manu-
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Contents • i
Contents
Contents......................................................................i
How to Use This Guide.............................................iii
Chapter 1 Introduction .............................................1
1.1 Features..............................................................................3
1.2 Applications........................................................................3
1.3 Specifications.....................................................................4
Chapter 2 Installation...............................................5
2.1 What You Have ...................................................................5
2.2 Unpacking...........................................................................5
2.3 PCB Layout of ACL-8454 .....................................................6
2.4 Default Configurations........................................................7
2.5 Base Address Setting..........................................................8
2.6 Pin Assignment of Connector............................................10
2.7 Clock System....................................................................11
2.8 Counters Architecture .......................................................12
2.9 Clock Source Configurations............................................17
2.10 Gate Control Configurations.............................................19
2.11 Counter Outputs................................................................20
2.12 DuaI Interrupt System.......................................................21
2.13 Digital Input and Output....................................................23
2.14 Summary of Default Setting..............................................24
2.15 Notes for Installing More 8254 Chips.................................24
2.16 Daughter Board Connection .............................................25
Chapter 3 Registers Format...................................26
3.1 I/O Port Address................................................................26
3.2 Timer/Counter Registers...................................................27
3.3 Chip Select Register.........................................................27

ii • Contents
3.4 Digital Input Registers.......................................................28
3.5 Digital Output Register......................................................28
3.6 Low-level Programming...................................................30
Chapter 4 Applications...........................................32
4.1 Timer / Counter Connection..............................................32
4.2 Frequency Generator........................................................33
4.3 Pulse Width Measurement................................................35
4.4 Frequency Measurement..................................................36
4.5 Event Counter...................................................................38
Chapter 5 C/C++ Library..........................................39
5.1 Installation........................................................................40
5.2 W_8454_Initial...................................................................42
5.3 Set_Chip...........................................................................43
5.4 W_8454_Write_Counter.....................................................44
5.5 W_8454_Read_Counter.....................................................45
5.6 W_8454_Stop_Counter......................................................45
5.7 W_8454_DO.......................................................................46
5.8 W_8454_DI ........................................................................47
5.9 8454 Mode Functions........................................................49
5.10 W_8454_INT_Enable..........................................................50
5.11 W_8454_INT_Disable.........................................................51
Appendix 8254 Timer Chip Operation.....................52
Product Warranty / Service......................................55

How to Use This Guide • iii
How to Use This Guide
This manual is designed to help you use the ACL-8454. The manual
describes how to modify various settings on the ACL-8454 card to
meet your requirements. It is divided into 5 chapters:
•Chapter 1, "Introduction," gives an overview of the product features,
applications, and specifications.
•Chapter 2, "Installation & Configurations" describes the operation
method and multi-functions of the ACL-8454. Users should read
through this chapter to understand the configurations of the ACL-
8454. The chapter will also teach user how to install the ACL-
8454.
•Chapter 3, "Registers Format," describes the details of register
format of the ACL-8454, this information is very useful for the
programmers who want to control the hardware by low level
programming.
•Chapter 4, "Signal Connection & Applications," describes the
connectors' pin assignment and how to connect the outside signal
and devices to / from the ACL-8454. Some applications also be
introduced.
•Chapter 5, "C/C++ Library" introduces the C-language library for
operating the ACL-8454. Some examples are shown too.

Introduction
•
1
1
Introduction
The ACL-8454 is a general purpose counter/timer and digital I/O
card.It is a compact-size add-on card for IBM AT compatible PC in
control, monitoring and sensing applications. There are two version
of ACL-8454: ACL-8454/6 and ACL-8454/12. ACL-8454/6 has two
8254 chips (6 counters) on board. ACL-8454/12 has four 8254 chips
(12 counters).
On ACL-8454/6, four counters are used for external signal, two
counters are cascaded as 32-bit timer. On ACL-8454/12, eight
counters are used for external signal, the rest of the four counters
are designed as two 32-bit cascaded counters.
This card has multi-configurations. The counters can be set as
independent counters or cascaded counters. The gate control of
every counter comes from either external source or internal
cascaded counter. The clock source comes from either internal or
external can be selected by jumper setting. A 10 MHz oscillator is
used as the base clock of internal clock sources.
It is possible to use this card on variety of powerful counter/timer
functions to match your industry and laboratory applications. Users
can set the configuration to fit the variety of applications, such as
timer, event counter, frequency generator, pulse width measurement,
and frequency measurement.
The card also provides digital output and input port. There are 8
digital output channels and these channels can be used to control
the external devices. There are digital input channels and these
channels are shared the same signal lines with the external clock

2
•
Introduction
and the external gate signals. Whenever the external clock or gate
signals are not used, they can be dedicatedly used as D/I. There are
at least 8 D/I bits under default setting of the ACL-8454 because only
two 8254 chips are used.
ACL-8454 provides one interrupt signal which comes from one of
four internal or external interrupt sources. Three internal interrupt
sources come from the counter output. One external interrupt source
shares with one D/I pin. The interrupt can be used for watchdog
timer or other applications. One of the 11 interrupt levels on the AT-
bus can be selected by setting jumper.
Figure 1.1 shows the block diagram of the ACL-8454.
Optional
8254
chip #1
8254
chip #2
8254
chip #3
8254
chip #4
8 bits
Digital Input
8 bits
Digital Output 8
data bus
buffer
address
decoder
Double
interrupt
level selector
(OUT) 3
address
switch
Clock
System
(CLK,GATE) 6
jumpers
(OUT) 2
(CLK,GATE) 2
(OUT) 3
(CLK,GATE) 6
(OUT) 2
(CLK,GATE) 2
8
PC bus
37 pin D-type connector
8 bits
Digital Input 8
Figure 1.1. Block diagram of the ACL-8454

Introduction
•
3
1.1 Features
The ACL-8454 Counter / Timer and Digital I/O Card provides the
following advanced features:
•Default 6 counters/timers are installed and it is expandable to 12
counters/timers at most
•Multi-configurations of counters / timers:
•Flexible setting for each independent counter, the clock source
could be external, internal or cascaded. The gate signal is
external controlled or internal cascaded signal.
•8 digital output channels
•16 digital input channels shared with the same signal lines with
external gate control and external clock input
•Two interrupt sources
•The first interrupt source comes from output of counter #6 and this
signal is jumper selectable to one of 4 IRQ channels.
•The second interrupt source comes from either internal periodic or
external source. This signal is jumper selectable to one of 5 IRQ
channels.
•Synchronized 4 channels frequency measurement is possible.
•37-pin D-type female connector.
•AT-Bus and compact size (Half-size only)
1.2 Applications
•Event counter
•Frequency generator
•Frequency synthesizer
•Pulse width measurement
•Low level pulse generator
•Timedelay
•Industry automation
•Watchdog timer
•Laboratory and Industrial automation

4
•
Introduction
1.3 Specifications
♦Programmable Counter/Timer
•Device : 8254 x 2 (default), or 8254 x 4 (at most)
•Counters : 16-bit down counter
•Clock source : internal clock, external source or cascaded
•Gate control : default enable or external control
♦Digital I/O ( DIO)
•# of input channels : 16 channels
•# of output channels : 8 channels (dedicated output)
•Electronics characteristics : TTL compatible signal
♦General Specifications
•I/O Base Address : 8 consecutive address space
•Dual Interrupt IRQ :
Lower IRQ: IRQ 3,5,6,7,9 (5 levels jumper selectable)
Higher IRQ: IRQ 10,11,12,15 (4 levels jumper selectable)
•Connector : 37-pin D-type female connector
•Operating Temperature : 0°C ~ 60°C
•Storage Temperature : -20°C ~ 80°C
•Humidity: 5 ~ 95%, non-condensing
•Power Consumption : +5 V @ 210 mA maximum
•Dimension : 163mm(L) X 108mm(W)

Installation
•
5
2
Installation
This chapter describes the configuration and function of the ACL-
8454 and the steps to install the ACL-8454. At first, the contents in
the package and unpacking information that you should care about
are described. The versatile configurations of ACL-8454 are
introduced so that you can configure it according to your applications.
The default setting of ACL-8454 is shown at the end of this chapter.
2.1 What You Have
In addition to this User's Manual, the package includes the following
items:
•ACL-8454 Enhanced Multi-function Counter/Timer Card
•ADLINK CD
If any of these items is missing or damaged, contact the dealer from
whom you purchased the product. Save the shipping materials and
carton in case you want to ship or store the product in the future.
2.2 Unpacking
Your ACL-8454 card contains sensitive electronic components that
can be easily damaged by static electricity. The card should be
unpacked on a grounded anti-static mat. The operator should be
wearing an anti-static wristband, grounded at the same point as the
anti-static mat.

6
•
Installation
Inspect the card module carton for obvious damage. Shipping and
handling may cause damage to your module. Be sure there are no
shipping and handing damages on the module before processing.
After opening the card module carton, extract the system module and
place it only on a grounded anti-static surface component side up.
Again inspect the module for damage. Press down on all the
socketed IC's to make sure that they are properly seated. Do this
only with the module place on a firm flat surface.
Note : DO NOT APPLY POWER TO THE CARD IF IT HAS BEEN
DAMAGED.
You are now ready to install your ACL-8454.
2.3 PCB Layout of ACL-8454
Figure 2.1 PCB Layout of the ACL-8454

Installation
•
7
2.4 Default Configurations
To operate the ACL-8454 correctly, users should understand the
structure of ACL-8454 and details of the possible configurations.
The block diagram of the ACL-8454 is shown in chapter 1. It
contains the clock system, counter system, interrupt system and
address decoder etc. The following sections describe the details
and the default setting is list in Table 2.1.
Items Default Configuration Setting by:
Base Address 0x240 S1
Clock Source #1 2M Hz CLOCK1
Clock Source #2 100K Hz CLOCK2
8254 chips U1, U2 installed
U3, U4 not installed --
Clock Sources of Counters
Internal Clock Source #1
(=2M Hz) CK n
Gate Sources of
Counter 1~4 External Gate G1 ~ G4
Interrupt Level #1 IRQ 15 JP1
Interrupt Level #2 No Connection JP2
Source of Interrupt Level #2 External Interrupt Sources JP3
Table 2.1 Default Configuration of ACL-8454
You can change the ACL-8454's default configuration by setting
jumpers and DIP switches on the card for your own applications. The
card's jumpers and switches are preset at the factory. A jumper
switch is closed (sometimes referred to as "shorted") with the plastic
cap in-serted over two pins of the jumper. A jumper is open with the
plastic cap inserted over one or no pin(s) of the jumper.
Before changing the default configuration, users must fully
understand the operation of the ACL-8454. The setting and the
basic operation theorem are discussed in this chapter. It is
recommended to refer chapter 3 for details of the registers and to
refer chapter 4 for application notes.

8
•
Installation
2.5 Base Address Setting
The ACL-8454 requires 8 consecutive address locations in the I/O
address space. The base address of the ACL-8454 is restricted by
the following conditions.
1.The base address must be within the rangeHex 200 to Hex 3FF.
2. The base address should not conflict with any reserved I/O
address. (See Appendix A.)
3. The base address must not conflict with any add-on card on
your own PC. Please check your PC before installing the ACL-
8454.
The base address of ACL-8454 is selected by an 6 positions DIP
switch S1. The default setting of base address is set to beHEX 240.
All possible base address combinations are listed as Table 2.2.
You may modify the base address if the default address has been
occupied by another add-on card.
ON
1 2 3 4 5 6
A ( 8 7 6 5 4 3 )
S1
A3 ~ A8 control the BASE I/O address.
Figure 2.2 Default Base Address Setting

Installation
•
9
I/O port
Address(Hex) 1 A8 2 A7 3 A6 4 A5 5 A4 6 A3
200-207 ON
(0) ON (0) ON (0) ON (0) ON (0) ON (0)
208-20F ON
(0) ON (0) ON (0) ON (0) ON (0) OFF (1)
210-217 ON
(0) ON (0) ON (0) ON (0) OFF (1) ON (0)
218-21F ON
(0) ON (0) ON (0) ON (0) OFF (1) OFF (1)
:::::::
237-23F
ON
(0) ON (0) ON (0) OFF (1) OFF (1) OFF (1)
240-247
(default) ON
(0) ON (0) OFF (1) ON (0) ON (0) ON (0)
248-24F ON
(0) ON (0) OFF (1) ON (0) ON (0) OFF (1)
:::::::
3F0-3F7 OFF
(1) OFF (1) OFF (1) OFF (1) OFF (1) ON (0)
3F8-3FF OFF
(1) OFF (1) OFF (1) OFF (1) OFF (1) OFF (1)
* A3, ..., A8 is corresponding to PC Bus address lines
Table 2.2. Possible Base Address Combinations

10
•
Installation
2.6 Pin Assignment of Connector
(1)
(9)
(8)
(7)
(6)
(5)
(2)
(3)
(4)
(14)
(10)
(13)
(11)
(12)
(19)
(15)
(18)
(16)
(37)
(24)
(23)
(21)
(22)
(20)
(25)
(28)
(26)
(27)
(29)
(34)
(30)
(33)
(31)
(32)
(35)
(36)
(17)
ECLK3(DI2)
ECLK4(DI3)
ECLK9(DI10)
ECLK7(DI8)
ECLK1(DI0)
ECLK2(DI1)
ECLK10(DI11/EInt)
ECLK8(DI9)
ExtG1(DI4)
ExtG2(DI5)
ExtG3(DI6)
ExtG4(DI7)
ExtG7(DI12)
ExtG8(DI13)
ExtG9(DI14)
ExtG10(DI15)
COUT1
COUT9
COUT3
COUT4
COUT8
COUT6
COUT7
COUT2
COUT10
COUT12(EInt)
DO0
DO2
DO6
DO1
DO4
DO5
DO3
DO7
+5V
GND
GND
CN1
Legend:
ECLK n : External clock source for counter #n
ExtG n : External gate signal for counter #n
COUT n : Counter/Timer output of counter #n
DO m : Digital output port channel #m
DI m : Digital input port channel #m
Eint : External interrupt signal input
Figure 2.3 Pin Assignment of Connector CN1
The pin assignment of the 37 pins D-type connector (CN1) is shown
in Figure 2.3. The abbreviations of signal names are listed in Table
2.3. The signal name conventions are used through this manual.
Some signal pins are multi-function signals. For example, the
ECLK10 are not only used as clock source of counter #10, but also
be used as external interrupt source and be connected to digital
input channel.