National Instruments DAQPad-6508, DAQPad-6507 User Manual

DAQPad™-6507/6508

User Manual

Digital I/O Devices for USB

DAQPad-6507/6508 User Manual

December 1998 Edition

Part Number 321724B-01

© Copyright 1997, 1998 National Instruments Corporation. All rights reserved.

Internet Support

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National Instruments Corporate Headquarters

6504 Bridge Point Parkway Austin, Texas 78730-5039 USA Tel: [phone]

© Copyright 1997, 1998 National Instruments Corporation. All rights reserved.

Important Information

Warranty

The DAQPad-6507 and DAQPad-6508 are warranted against defects in materials and workmanship for a period of
one year from the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its
option, repair or replace equipment that proves to be defective during the warranty period. This warranty includes parts
and labor.

The media on which you receive National Instruments software are warranted not to fail to execute programming
instructions, due to defects in materials and work man ship, for a peri od of 90 d ays from da te o f sh ipm ent, as evi denced
by receipts or other documentation. National Instruments will, at its option, repair or replace software media that do not
execute programming instructions if National Instruments receives noti ce of su ch defect s d uring th e warranty perio d.
National Instruments does not warrant that the op eration of t he soft ware shall b e uni nterrup ted or erro r free.

A Return Material Authorization (RMA) number must b e ob tain ed fro m th e facto ry an d clearl y mark ed on t he outsi de
of the package before any equipment will be a ccepted for warranty work. National Instruments will pay the shipping c osts
of returning to the owner parts which are covered by warran ty.

National Instruments believes that the information in this manual is accurate. The document has been c arefully reviewed
for technical accuracy. In the event that technical or typographical errors exist, National Instruments reserves the right to
make changes to subsequent editions of th is do cume nt with ou t p rio r no ti ce to hold ers o f thi s ed itio n. The read er sh ou ld
consult National Instruments if errors are suspected. In no event shall National Instruments be liable for any damages
arising out of or related to this docume nt o r th e in form ati on con tai ned in i t.

XCEPT AS SPECIFIED HEREIN

E

ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
BY FAULT OR NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE
CUSTOMER
OR INCIDENTAL OR CONSEQUENTIAL DAMAGES, EVEN IF ADVISED OF THE POSSIBILITY THEREOF

National Instruments will apply regardless of the form of action, wh ether in con tract or tort , incl udin g n egli gen ce.
Any action against National Instruments must be brought within one year after the cause of action accrues. National
Instruments shall not be liable for any delay in performance due to causes beyond its reasonable control. The warranty
provided herein does not cover damages, defects, malfuncti ons, or s ervice failur es caused by own er’s fai lure to fol low
the National Instruments installation, operation, or maintenance instructions; owner’s modification of the product;
owner’s abuse, misuse, or negligent acts; and power failure or surges, fire, flood, accident, actions of third parties,
or other events outside reasonable control.

ATIONAL INSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA, PROFITS, USE OF PRODUCTS

. N

ATIONAL INSTRUMENTS MAKES NO WARRANTIES, EXPRESS OR IMPLIED, AND SPECIFICALLY DISCLAIMS

, N

USTOMER’S RIGHT TO RECOVER DAMAGES CAUSED

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. This limitation of the liability of

,

Copyright

Under the copyright laws, this publication may not be reproduced or transmitted in any form, electronic or mechanical,
including photocopying, recording, storing in an information retrieval system, or translating, in whole or in part, without
the prior written consent of National Instruments Corporation.

Trademarks

ComponentWorks™, CVI™, DAQPad™, LabVIEW™, NI-DAQ™, SCXI™, and VirtualBench™ are trademarks of
National Instruments Corporation.

Product and company names listed are trademarks or trade names of their respective companies.

WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS

National Instruments products are not designed with com ponent s and tes ting inten ded to ensure a l evel of reliab ilit y
suitable for use in treatment and diagnosis of humans. Applications of National Instruments products invol ving m edical
or clinical treatment can create a potential for accidental injury caused by product failure, or by errors on the part of the
user or application designer. Any use or application of National Instruments products for or involving medical or clinical
treatment must be performed by properly trained and qualified medical personnel, and all traditional medical safeguards,
equipment, and procedures that are appropriate in the particular situation to prevent serious injury or death should always
continue to be used when National Instruments products are being used . National Instrum ents product s are NOT intended
to be a substitute for any form of established process, procedure, or equipment used to monitor or safeguard human health
and safety in medical or clinical treatment.

About This Manual

Organization of This Manual...........................................................................................ix

Conventions Used in This Manual................................................................................... x

National Instruments Documentation...................................... .................................. ......xi

Related Documentation........................................... .................................. .......................xii

Customer Communication................................... .................................. ..........................xii

Chapter 1
Introduction

About the DAQPad-6507 and DAQPad-6508 Devices...................................................1-1

What You Need to Get Started........................................................................................1-2

Software Programming Choices......................................................................................1-2

National Instruments Application Software......................................................1-3

NI-DAQ Driver Software..................................................................................1-4

Optional Equipment................................................ .................................. .......................1-5

Custom Cabling.................................................................................................1-6

Unpacking........................................................................................................................1-6

Contents

Chapter 2
Installation and Configuration

Software Installation........................................................................................................2-1

Hardware Installation.......................................................................................................2-1

Configuration...................................................................................................................2-4

Power Considerations ......................................................................................................2-4

Chapter 3
Signal Connections

I/O Connector Pin Description ........................................................................................3-2

I/O Connector Signal Connection Descriptions...............................................................3-3

Port C Pin Assignments.....................................................................................3-4

Cable Assembly Connectors............................................................................................3-4

Digital I/O Signal Connections........................................................................................3-7

Power Connections ..........................................................................................................3-8

Connecting Power Sources to Digital I/O Lines ...............................................3-8

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National Instruments Corporation v DAQPad-6507/6508 User Manual

Contents

Digital I/O State Selection...............................................................................................3-9

High DIO State..................................................................................................3-9

Low DIO State..................................................................................................3-10

Floating DIO State............................................................................................3-11

Timing Specifications......................................................................................................3-12

Mode 1 Input Timing........................................................................................ 3-13

Mode 1 Output Timing .....................................................................................3-14

Mode 2 Bidirectional Timing............................................................................3-15

Chapter 4
Theory of Operation

Interrupt Control Circuitry ..............................................................................................4-2

USB Microcontroller....................................................................................... ................4-2

82C55A Programmable Peripheral Interface ..................................................................4-2

Digital I/O Connector......................................................................................................4-3

Appendix A
Specifications

Appendix B
OKI 82C55A Data Sheet

Appendix C
Common Questions

Appendix D
Customer Communication

Glossary

Index

Figures

Figure 1-1. The Relationship between the Programming Environment,

NI-DAQ, and Your Hardware.................................. ... ............................1-5

Figure 2-1. Connection between Your Computer or USB Hub and

Your DAQPad Device ...........................................................................2-2

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Tables

Contents

Figure 2-2. Upstream and Downstream Connections between the

Host Computer and the DAQPad-6507 or DAQPad-6508 ....................2-4

Figure 3-1. Screw Terminal Assignments for the DAQPad-6507.............................3-1

Figure 3-2. Digital I/O Connector Pin Assignments for the DAQPad-6508 .............3-2

Figure 3-3. Cable Assembly Connector Pin Assignments for Pins 1 through 50

of the DAQPad-6508 I/O Connector.......................................................3-5

Figure 3-4. Cable Assembly Connector Pin Assignments for Pins 51 through

100 of the DAQPad-6508 I/O Connector................................................3-6

Figure 3-5. Digital I/O Connections...........................................................................3-7

Figure 3-6. DIO Channel Configured for High DIO State with External Load.........3-9

Figure 3-7. DIO Channel Configured for Low DIO State with External Load .........3-11

Figure 4-1. DAQPad-6507/6508 Devices Block Diagram ........................................4-1

Table 2-1. LED Patterns for DAQPad-6507/6508 States.........................................2-3

Table 3-1. Pin Assignments for the DAQPad-6508 ................................................. 3-3

Table 3-2. Port C Signal Assignments......................................................................3-4

Table 3-3. Timing Signal Descriptions.....................................................................3-12

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National Instruments Corporation vii DAQPad-6507/6508 User Manual

This manual describes the mechanical and electrical aspects of the
DAQPad-6507 and DAQPad-6508 and contains information concerning
their operation and programming.

The DAQPad-6507 and DAQPad-6508 are digital I/O devices for
USB-compatible computers. These devices are designed for
high-performance data acquisition and control for applications in
laboratory testing, production testing, and industrial process monitoring
and control.

Organization of This Manual

The DAQPad-6507/6508 User Manual is organized as follows:

• Chapter 1, Introduction, describes the DAQPad-6507 and
DAQPad-6508; lists what you need to get started; describes software
programming choices, optional equipment, and custom cables; and
explains how to unpack the DAQPad-6507 and DAQPad-6508.

• Chapter 2, Installation and Configuration, describes how to install and
configure the DAQPad-6507 and DAQPad-6508 devices.

• Chapter 3, Signal Connections, includes timing specifications and
signal connection instructions for the DAQPad-6507 and 6508 I/O
connectors.

• Chapter 4, Theory of Operation, contains a functional overvie w of the
DAQPad-6507/6508 devices and explains the operation of each
functional unit making up the DAQPad-6507 or DAQPad-6508.

• Appendix A, Specifications, lists the specifications of the
DAQPad-6507/6508 devices.

• Appendix B, OKI 82C55A Data Sheet, contains the manufacturer data
sheet for the OKI 82C55A (OKI Semiconductor) CMOS
programmable peripheral interface. This interface is used on the
DAQPad-6507/6508 devices.

• Appendix C, Common Questions, contains a list of commonly asked
questions and their answers relating to usage and special features of
your DAQPad-6507/6508 devices.

About

This

Manual

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National Instruments Corporation ix DAQPad-6507/6508 User Manual

About This Manual

• Appendix D, Customer Communication, contains forms you can use to
request help from National Instruments or to comment on our
products.

• The Glossary contains an alphabetical list and description of terms
used in this manual, including abbreviations, acronyms, metric
prefixes, mnemonics, and symbols.

• The Index alphabetically lists the topics in this manual, including the
page where you can find each one.

Conventions Used in This Manual

The following conventions are used in this manual:
This icon to the left of bold italicized text denotes a note, which alerts you

to important information.

!

82C55A 82C55A refers to the OKI 82C55A (OKI Semiconductor) CMOS

< > Angle brackets containing numbers separated by an ellipses represent

bold italic Bold italic text denotes a note, caution, or warning.
italic Italic text denotes emphasis, a cross reference, or an introduction to a key

monospace Text in this font denotes text or characters that you should literally enter

NI-DAQ NI-DAQ refers to the NI-DAQ software for PC compatibles unless

SCXI SCXI stands for Signal Conditioning eXtensions for Instrumentation and is

This icon to the left of bold italicized text denotes a caution, which advises
you of precautions to take to avoid injury, data loss, or a system crash.

programmable peripheral interface.

a range of values associated with a bit or signal name (for example,
ACH<0..7>).

concept.

from the keyboard, sections of code, programming examples, and syntax
examples. This font is also used for the proper names of disk drives, paths,
directories, programs, subprograms, subroutines, device names, functions,
operations, variables, filenames and extensions, and for statements and
comments taken from programs.

otherwise noted.

a National Instruments product line designed to perform front-end signal
conditioning for National Instruments plug-in DAQ devices.

DAQPad-6507/6508 User Manual x

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National Instruments Corporation

National Instruments Documentation

The DAQPad-6507/6508 User Manual is one piece of the documentation
set for your data acquisition (DAQ) system. You could have any of several
types of manuals, depending on the hardware and software in your system.
Use the different types of manuals you have as follows:

• Getting Started with SCXI—If you are using SCXI, this is the first
manual you should read. It gives an overview of the SCXI system and
contains the most commonly needed information for the modules,
chassis, and software.

• Y our SCXI hardware user manuals—If you are using SCXI, read these
manuals next for detailed information about signal connections and
module configuration. They also explain in greater detail how the
module works and contain application hints.

• Your DAQ hardware user manuals—These manuals have detailed
information about the DA Q hardware that plugs into or is connected to
your computer. Use these manuals for hardware installation and
configuration instructions, specification information about your DAQ
hardware, and application hints.

• Software documentation—Examples of software documentation you
may have are the LabVIEW, LabWindows/CVI, and NI-DAQ
documentation sets. After you set up your hardware system, use
either the application software (LabVIEW or LabWindows/CVI)
documentation or the NI-DAQ documentation to help you write your
application. If you have a large and complicated system, it is
worthwhile to look through the software documentation before you
configure your hardware.

• Accessory installation guides or manuals—If you are using accessory
products, read the terminal block and cable assembly installation
guides or accessory device user manuals. They explain how to
physically connect the relevant pieces of the system. Consult these
guides when you are making your connections.

• SCXI Chassis User Manual—If you are using SCXI, read this manual
for maintenance information on the chassis and installation
instructions.

About This Manual

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National Instruments Corporation xi DAQPad-6507/6508 User Manual

About This Manual

Related Documentation

If you are a register-level programmer, the following documents contain
information that you may find helpful as you read this manual:

• Your computer technical reference manual

• USB Specification, Revision 1.1

Customer Communication

National Instruments wants to receive your comments on our products and
manuals. We are interested in the applications you develop with our
products, and we want to help if you have problems with them. To make it
easy for you to contact us, this manual contains comment and configuration
forms for you to complete. These forms are in Appendix D, Customer

Communication, at the end of this manual.

DAQPad-6507/6508 User Manual xii

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National Instruments Corporation

Chapter

Introduction

This chapter describes the DAQPad-6507 and DAQPad-6508; lists what
you need to get started; describes software programming choices, optional
equipment, and custom cables; and explains how to unpack the
DAQPad-6507 and DAQPad-6508.

1

About the DAQPad-6507 and DAQPad-6508 Devices

Thank you for purchasing the National Instruments DAQPad-6507 or
DAQPad-6508. Your DAQPad device is a 96-bit, parallel, digital I/O
interface for computers with USB ports. Four 82C55A programmable
peripheral interface (PPI) chips control the 96 bits of digital I/O. The
82C55A can operate in either a unidirectional or bidirectional mode and
can generate interrupt requests to the host computer. You can program
the 82C55A for almost any 8-bit or 16-bit digital I/O application. All
communication is through a standard, 100-pin, female connector for the
DAQPad-6508 or 100-screw terminals with a strain-relief clamp for the
DAQPad-6507.

Your DAQPad device has a wide input voltage range, and can be powered
from any 9 to 30 VDC power supply.

You can use your DAQPad device in a wide range of digital I/O
applications. With the DAQPad-6507 and DAQPad-6508 devices, you can
interface any PC to any of the following:

• Other computers:
– Another PC with a National Instruments PC-DIO-96/PnP,

PC-DIO-24/PnP, AT-DIO-32F, DAQPad-6507, or DAQPad-6508

– Any other computer with an 8-bit or 16-bit parallel interface

• Centronics-compatible printers and plotters

• Panel meters

• Instruments and test equipment with BCD readouts and/or controls

• Optically isolated, solid-state relays and I/O module mounting racks

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National Instruments Corporation 1-1 DAQPad-6507/6508 User Manual

Chapter 1 Introduction

Note Your DAQPad device cannot sink sufficient current to drive the SSR-OAC-5 and

SSR-OAC-5A output modules. However, it can drive the SSR-ODC-5 output
module and all SSR input modules available from National Instruments.

If you need to drive an SSR-OAC-5 or SSR-OAC-5A, you can either use
a non-inverting digital buffer chip between your DAQPad device and the SSR
backplane, or you can use an MIO series device with appropriate connections
(for example, an SC-205X and cables).

With a DAQPad-6507or DAQPad-6508, your computer can serve as a
digital I/O system controller for laboratory testing, production testing, and
industrial process monitoring and control.

Detailed specifications of the DAQPad-6507 and DAQPad-6508 devices
are in Appendix A, Specifications.

What You Need to Get Started

To set up and use your DAQPad-6507 or DAQPad-6508, you will need the
following:

❑ DAQPad-6507 or DAQPad-6508 device
❑ DAQPad-6507/6508 User Manual
❑ One of the following software packages and documentation:

– NI-DAQ for PC Compatibles
– LabVIEW for Windows
– LabWindows/CVI
– ComponentW orks
– VirtualBench

❑ Your computer

Software Programming Choices

There are several options to choose from when programming your
National Instruments DAQ and SCXI hardware. You can use LabVIEW,
LabWindows/CVI, ComponentWorks, VirtualBench, NI-DAQ, or
register-level programming.

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National Instruments Corporation

National Instruments Application Software

LabVIEW and LabWindows/CVI are innovative program development
software packages for data acquisition and control applications. LabVIEW
uses graphical programming, whereas LabWindows/CVI enhances
traditional programming languages. Both packages include extensive
libraries for data acquisition, instrument control, data analysis, and
graphical data presentation.

LabVIEW features interactive graphics, a state-of-the-art user interface,
and a powerful graphical programming language. The LabVIEW Data
Acquisition VI Library, a series of VIs for using LabVIEW with National
Instruments DAQ hard ware, is included with LabVIEW. The LabVIEW
Data Acquisition VI Library is functionally equivalent to the NI-DAQ
software.

LabWindows/CVI features interactive graphics, a state-of-the-art user
interface, and uses the ANSI standard C programming language. The
LabWindows/CVI Data Acquisition Library , a series of functions for using
LabWindows/CVI with National Instruments DAQ hardware, is included
with the NI-DAQ software kit. The LabWindows/CVI Data Acquisition
Library is functionally equivalent to the NI-DAQ software.

Chapter 1 Introduction

ComponentWorks contains tools for data acquisition and instrument
control built on NI-DAQ driver software. ComponentWorks provides a
higher-level programming interface for building virtual instruments
through standard OLE controls and DLLs. With ComponentWorks, you
can use all of the configuration tools, resource management utilities, and
interactive control utilities included with NI-DAQ.

VirtualBench features virtual instruments that combine DAQ products,
software, and your computer to create a stand-alone instrument with the
added benefit of the processing, display, and storage capabilities of yo ur
computer. VirtualBench instruments load and save waveform data to disk
in the same forms that can be used in popular spreadsheet programs and
word processors.

Using LabVIEW, LabWindows/CVI, ComponentWorks, or VirtualBench
software will greatly reduce the development time for your data acquisition
and control application.

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National Instruments Corporation 1-3 DAQPad-6507/6508 User Manual

Chapter 1 Introduction

NI-DAQ Driver Software

The NI-DAQ driver software is included at no charge with all National
Instruments DAQ hardware. NI-DAQ is not packaged with SCXI or
accessory products, except for the SCXI-1200. NI-DAQ has an extensive
library of functions that you can call from your application programming
environment. These functions include routines for analog input (A/D
conversion), buffered data acquisition (high-speed A/D conversion),
analog output (D/A conversion), waveform generation, digital I/O,
counter/timer operations, SCXI, RTSI, self-calibration, messaging, and
acquiring data to extended memory.

NI-DAQ has both high-level D AQ I/O functions for maximum ease of use
and low-level DAQ I/O functions for maximum flexibility and
performance. Examples of high-level functions are streaming data to disk
or acquiring a certain number of data points. An example of a low-level
function is writing directly to registers on the DAQ device. NI-DAQ does
not sacrifice the performance of National Instruments DAQ devices
because it lets multiple devices operate at their peak performance.

NI-DA Q also internally addresses man y of the comple x issues between the
computer and the DAQ hardware such as programming interrupts and
DMA controllers. NI-DAQ maintains a consistent software interface
among its different versions so that you can change platforms with minimal
modifications to your code. Whether you are using conventional
programming languages or NI-DAQ software, your application uses the
NI-DAQ driver software, as illustrated in Figure 1-1.

DAQPad-6507/6508 User Manual 1-4

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National Instruments Corporation

Chapter 1 Introduction

Figure 1-1. The Relationship between the Programming Environment,

Optional Equipment

Conventional

Programming Environment

DAQ or

SCXI Hardware

NI-DAQ, and Your Hardware

ComponentWorks,

LabVIEW,

LabWindows/CVI, or

VirtualBench

NI-DAQ

Driver Software

Personal

Computer or

Workstation

National Instruments offers a variety of products to use with your
DAQPad-6508 device, including cables, connector blocks, and other
accessories, as follows:

• Cables and cable assemblies

• Connector blocks and unshielded 50-pin screw terminals

• SCXI modules and accessories for isolating, amplifying, exciting, and
multiplexing signals—from up to 3,072 channels—for relays and
analog output

• Low channel count signal conditioning modules, devices, and
accessories, including conditioning for strain gauges and RTDs,
simultaneous sample and hold, and relays

For more specific information about these products, refer to your National
Instruments catalogue or website, or call the office nearest you.

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National Instruments Corporation 1-5 DAQPad-6507/6508 User Manual

Chapter 1 Introduction

Custom Cabling

National Instruments offers cables and accessories for you to prototype
your application or to use if you frequently change device interconnections.

You can connect the DAQPad-6508 device to a wide range of printers,
plotters, test instruments, I/O racks and modules, screw terminal panels,
and almost any device with a parallel interface. The DAQPad-6508 digital
I/O connector is a standard, 100-pin header connector. Adapters for this
header connector expand the interface to four 50-pin ribbon cables, each of
which has the pinout of a PC-DIO-24. The pin assignments of the
expansion cables are compatible with the standard 24-channel I/O module
mounting racks (such as those manufactured by Opto 22 and Gordos).

The CB-100 cable termination accessory is available from National
Instruments for use with your DA QPad device. This accessory includes tw o
50-conductor, flat-ribbon cables and a connector block. You can attach
signal input and output wires to screw terminals on the connector block
and, therefore, connect signals to your DAQPad device I/O connector.

You can use the CB-100 for initial prototyping of an application or in
situations in which your DAQPad device interconnections are frequently
changed. When a final field wiring scheme has been developed, you might
want to develop your own cable.

If you want to develop your own cable, the mating connector for the
DAQPad-6508 is a 100-position, right-angle receptacle without board
locks. Recommended manufacturer part numbers for this mating connector
are as follows:

• AMP Corporation (part number 749076-9)

• Honda Corporation (part number PCS-XE100LFD-HS)

Unpacking

Your DAQPad-6507 or DAQPad-6508 device is shipped in an antistatic
package to prevent electrostatic damage to the device. Electrostatic
discharge can damage several components on the device. To avoid such
damage in handling the device, never touch the exposed pins of connectors.

DAQPad-6507/6508 User Manual 1-6

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National Instruments Corporation

Installation and

Chapter

Configuration

This chapter describes how to install and configure the DAQPad-6507 and
DAQPad-6508 devices.

Software Installation

You should install your software before you install your DAQPad-6507
or DAQPad-6508. If you are using LabVIEW, LabWindows/CVI,
ComponentWorks, or VirtualBench, install this software before installing
NI-DAQ driver software. Refer to your software release notes for your
software for installation instructions.

Note

The DAQPad-6507/6508 devices require NI-DAQ 6.0 or 6.1 for Windows 95, or
NI-DA Q 6.5 or later for Windows 98 (strongly recommended with USB). To ensure
that you have the latest version of NI-DAQ, install it from the CD that ships with
your device.

To install NI-DAQ, refer to your NI-DAQ rel ease not es. Fi nd the
installation section for your operating system and follow the instructions
given there.

2

Hardware Installation

You can connect your DAQPad-6507 or DAQPad-6508 to any available
USB socket. The following are general installation instructions, but consult
your computer user manual or technical reference manual for specific
instructions and warnings. Refer to Figure 2-1 to learn more about making
connections for DAQPad-6507/6508 device.

The following are general installation instructions, but consult your
personal computer user manual or technical reference manual for specific
instructions and warnings.

Note

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National Instruments Corporation 2-1 DAQPad-6507/6508 User Manual

To ensure proper operation of your DAQP ad device, f ollo w the instructions in the
sequence shown below . Otherwise, your DA QPad might not initialize properly, and

Chapter 2 Installation and Configuration

you will need to turn off the DAQPad rocker switch and restart your DAQPad
device again.

1. Connect the USB cable from the computer port or from any hub to the
port on your DA QPad device. Refer to Figure 2-1 for more information
on connections.

Upstream Connector

Computer or Hub

Downstream Connector

DAQPad

Figure 2-1. Connection between Your Computer or USB Hub and Your DAQPad Device

2. Flip the rocker switch to turn the power on for the DAQPad-6507 or
DAQPad-6508. Your computer should detect your DAQPad device
immediately, and when the computer recognizes your D A QPad device,
the LED on the front panel blinks or lights up, depending on the status
of your device.

3. If the LED comes on after the DAQPad is powered and connected to
the host, it is functioning properly. Refer to Table 2-1 for LED pattern
descriptions for your DAQPad device.

4. Configure your DA QP ad device and any accessories with the NI-D A Q
Configuration Utility.

When the LED blinks, it turns on and off for one second each for as many
times as necessary, then waits three seconds before repeating the cycle.

DAQPad-6507/6508 User Manual 2-2

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National Instruments Corporation

LED

Chapter 2 Installation and Configuration

Table 2-1. LED Patterns for DAQPad-6507/6508 States

DAQPad-6507/6508

State

Description

Off Off or in the low power ,

suspend mode

Your DAQPad device is turned
off or in the low po wer, suspend
mode.

2 blinks Addressed state This pattern is displayed if the

host computer detects your
DAQPad device but cannot
configure it because there are
no system resources available.
If your DA QPad remains in this
state, check your software
installation.

3 blinks Power supply failure This pattern is displayed if you

try to draw too much power
from the USB. You must attach
the external power supply.

4 blinks General error state If this pattern is displayed,

contact National Instruments.

On Configured state Your DAQPad device is

configured.

Note The DAQPad-6507/6508 devices use 100 kΩ resistors for polarity selection.

These signals are controlled by a switch on the back of your DAQPad.
For more information, see the Digital I/O State Selection section in Chapter 3,

Signal Connections.

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National Instruments Corporation 2-3 DAQPad-6507/6508 User Manual

Chapter 2 Installation and Configuration

Your DAQPad-6507/6508 device is now installed. Refer to Figure 2-2 to
learn more about upstream and downstream connections between the host
computer and the DAQPad-6507/6508 devices.

Host Computer with

Upstream Connector

Figure 2-2. Upstream and Downstream Connections between the Host Computer

Configuration

The DAQPad-6507/6508 devices are completely software-configurable,
hot Plug and Play instruments. The Plug and Play services query the
instrument and allocate the required resources. The operating system
enables the instrument for operation. Refer to your software documentation
for more information.

Power Considerations

The DAQPad device remains powered up only when the USB cable
connects it to the host computer and the computer is powered up. The host
computer has the ability to go into a power-saving suspend mode. During
this time, your DAQPad device can also go into a low-power mode, and the
I/O signals remain in a fully powered, static state. The advantage of the
low-power mode is that it conserves power. This mode is important if you
are using a battery pack, even though all of the analog circuitry and digital
I/O is powered off and the +5 V supply on the I/O connector is turned off
in this state.

DAQPad-6507/6508 with

Downstream Connector

and the DAQPad-6507 or DAQPad-6508

DAQPad-6507/6508 User Manual 2-4

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National Instruments Corporation

Chapter 2 Installation and Configuration

When the DAQPad exits the suspend mode, NI-DAQ will reinitialize your
DAQPad device and all I/O signals to their default state, regardless of
whether your DAQPad device is in low power mode or static mode. This
action might change the current I/O states and gain if your DA QP ad device
is the low powered, static mode.

The default behavior of your DAQPad device is to go into powered,
static state when the computer enters its suspend mode.

In the powered static state of your DAQPad device, you can draw current
from the +5 V pin on the connector and all digital I/O lines and analog
output channels will be static at a fixed voltage.

Note Refer to the Set_DAQ_Device_Info function in the NI-D AQ Function Reference

Manual to change the settings that determine the behavior of your DA QP ad device

during the suspend state.

If low-power consumption is a concern, the recommended way to turn off
your DAQPad device is with the rocker switch located on the rear panel.
This switch turns your DAQPad device on and off by disconnecting both
the external power supply and the USB supply.

It is also possible to turn off your DAQPad device by detaching the
USB cable while leaving the external supply attached; however, several
milliamperes are continually drawn from the external supply in this case,
although no power is drawn from the USB supply . If you are using a battery
pack, such as the BP-1, it is best to use the rocker switch on the back panel
to prolong the charge of the battery.

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National Instruments Corporation 2-5 DAQPad-6507/6508 User Manual

Chapter

Signal Connections

This chapter includes timing specifications and signal connection
instructions for the DAQPad-6507 and DAQPad-6508 I/O connectors.

Caution

!

Connections that exceed any of the maximum ratings of input or output signals
on the DA QPad-6507/6508 devices can damage the device and the computer. The
description of each signal in this section includes information about maximum
input ratings. National Instruments is
any inaccurate signal connections.

To learn more about screw terminal assignments on the DAQPad-6507,
refer to Figure 3-1.

01234567

APB

012345

G

G

N

N

D

D

01234567

APA

APC

3

liable for any damages resulting from

not

BPA

01234567

BPB

67

01234567

BPC

01234567

CPA

V

cc

01234567

Figure 3-1.

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National Instruments Corporation 3-1 DAQPad-6507/6508 User Manual

1234567

0V

cc

CPB

01234567

CPC

Screw Terminal Assignments for the DAQPad-6507

01234567

01234567

01234567

DPA

DPB

DPC

Chapter 3 Signal Connections

I/O Connector Pin Description

Figure 3-2 shows the pin assignments for the DAQPad-6507/6508 digital
I/O connector.

APC7 CPC7
BPC7 DPC7
APC6 CPC6
BPC6 DPC6
APC5 CPC5
BPC5 DPC5
APC4 CPC4
BPC4 DPC4
APC3 CPC3
BPC3 DPC3
APC2 CPC2
BPC2 DPC2
APC1 CPC1
BPC1 DPC1
APC0 CPC0
BPC0 DPC0

APB7 CPB7
BPB7 DPB7
APB6 CPB6
BPB6 DPB6
APB5 CPB5
BPB5 DPB5
APB4 CPB4
BPB4 DPB4
APB3 CPB3
BPB3 DPB3
APB2 CPB2
BPB2 DPB2
APB1 CPB1
BPB1 DPB1
APB0 CPB0
BPB0 DPB0
APA7 CPA7
BPA7 DPA7
APA6 CPA6
BPA6 DPA6
APA5 CPA5
BPA5 DPA5
APA4 CPA4
BPA4 DPA4
APA3 CPA3
BPA3 DPA3
APA2 CPA2
BPA2 DPA2
APA1 CPA1
BPA1 DPA1
APA0 CPA0
BPA0 DPA0

GND GND

151
252
353
454
555
656
757
858
959

10 60

11 61
12 62
13 63
14 64
15 65
16 66
17 67
18 68
19 69
20 70
21 71
22 72
23 73
24 74
25 75
26 76
27 77
28 78
29 79
30 80
31 81
32 82
33 83
34 84
35 85
36 86
37 87
38 88
39 89
40 90
41 91
42 92
43 93
44 94
45 95
46 96
47 97
48 98

+5 V +5 V

49 99
50 100

Figure 3-2.

Digital I/O Connector Pin Assignments for the DAQPad-6508

DAQPad-6507/6508 User Manual 3-2

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National Instruments Corporation

Chapter 3 Signal Connections

I/O Connector Signal Connection Descriptions

Refer to Table 3-1 for pin assignments for the DAQPad-6508.

Table 3-1.

Pin Assignments for the DAQPad-6508

Pin Signal Name Description

1, 3, 5, 7, 9, 11, 13, 15 APC<7..0> Bidirectional Data Lines for Port C of

PPI A—APC7 is the MSB, APC0 the LSB.

17, 19, 21, 23, 25, 27, 29, 31 APB<7..0> Bidirectional Data Lines for Port B of

PPI A—APB7 is the MSB, APB0 the LSB.

33, 35, 37, 39, 41, 43, 45, 47 APA<7..0> Bidirectional Data Lines for Port A of

PPI A—AP A7 is the MSB, APA0 the LSB.

2, 4, 6, 8, 10, 12, 14, 16 BPC<7..0> Bidirectional Data Lines for Port C of

PPI B—BPC7 is the MSB, BPC0 the LSB.

18, 20, 22, 24, 26, 28, 30, 32 BPB<7..0> Bidirectional Data Lines for Port B of

PPI B—BPB7 is the MSB, BPB0 the LSB.

34, 36, 38, 40, 42, 44, 46, 48 BPA<7..0> Bidirectional Data Lines for Port A of

PPI B—BPA7 is the MSB, BPA0 the LSB.

51, 53, 55, 57, 59, 61, 63, 65 CPC<7..0> Bidirectional Data Lines for Port C of

PPI C—CPC7 is the MSB, CPC0 the LSB.

67, 69, 71, 73, 75, 77, 79, 81 CPB<7..0> Bidirectional Data Lines for Port B of

PPI C—CPB7 is the MSB, CPB0 the LSB.

83, 85, 87, 89, 91, 93, 95, 97 CPA<7..0> Bidirectional Data Lines for Port A of

PPI C—CPA7 is the MSB, CPA0 the LSB.

52, 54, 56, 58, 60, 62, 64, 66 DPC<7..0> Bidirectional Data Lines for Port C of

PPI D—DPC7 is the MSB, DPC0 the LSB.

68, 70, 72, 74, 76, 78, 80, 82 DPB<7..0> Bidirectional Data Lines for Port B of

PPI D—DPB7 is the MSB, DPB0 the LSB.

84, 86, 88, 90, 92, 94, 96, 98 DPA<7..0> Bidirectional Data Lines for Port A of

PPI D—DP A7 is the MSB, DPA0 the LSB.

49, 99 +5 V +5 V—These pins are connected to the

DAQPad’s +5 VDC supply.

50, 100 GND Ground—These pins are connected to the

computer’s ground signal.

Note

: Pins 49 and 99 are connected to the +5 V PC power supply via a 1 A self-resetting fuse.

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National Instruments Corporation 3-3 DAQPad-6507/6508 User Manual

Chapter 3 Signal Connections

Port C Pin Assignments

The signals assigned to port C depend on the mode in which the 82C55A is
programmed in your application software. In mode 0, port C is considered
as two 4-bit I/O ports. In modes 1 and 2, port C is used for status
and handshaking signals with zero, two, or three lines available for
general-purpose input/output. Table 3-2 summarizes the signal
assignments of port C for each programmable mode.

Caution

!

Programming

Mode

During programming, be aware that each time a port is configured, output ports A
and C are reset to 0, and output port B is undefined.

Table 3-2.

Port C Signal Assignments

Group A Group B

PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0

Mode 0 I/O I/O I/O I/O I/O I/O I/O I/O
Mode 1 Input I/O I/O IBF

STBA* INTRASTBB* IBFBBINTR

A

Mode 1 Output OBFA* ACKA* I/O I/O INTRAACKB* OBFB* INTR
Mode 2 OBFA* ACKA* IBF

STBA* INTRAI/O I/O I/O

A

* Indicates that the signal is active low; refer to Table 3-3 for signal name definitions.

Cable Assembly Connectors

The cable assembly referred to in the Optional Equipment section in
Chapter 1, Introduction, is an assembly of two 50-pin cables and three
connectors. Both cables are joined to a single connector on one end and to
individual connectors on the free ends. The 100-pin connector that joins the
two cables plugs into the I/O connector of the DAQPad-6508. The other
two connectors are 50-pin connectors, one of which is connected to pins 1
through 50, and the other is connected to pins 51 through 100 of the
DAQPad-6508 I/O connector. The cables are labelled Position 1-50 and
51-100, respectively. Figures 3-3 and 3-4 show the pin assignments for the
50-pin connectors on the cable assembly.

B

B

DAQPad-6507/6508 User Manual 3-4

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National Instruments Corporation

Chapter 3 Signal Connections

APC7
APC6

APC5

APC4

APC3

APC2
APC1
APC0

APB7

APB6

APB5

APB4

APB3

APB2

APB1
APB0
APA7

APA6

APA5

APA4

APA3

APA2

APA1

APA0

+5 V

12
34
56
78

910
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
41 42
43 44
45 46
47 48
49 50

BPC7
BPC6
BPC5
BPC4
BPC3
BPC2
BPC1
BPC0

BPB7
BPB6

BPB5
BPB4
BPB3
BPB2
BPB1
BPB0
BPA7
BPA6
BPA5
BPA4
BPA3
BPA2
BPA1
BPA0
GND

Figure 3-3. Cable Assembly Connector Pin Assignments for Pins 1 through 50

of the DAQPad-6508 I/O Connector

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National Instruments Corporation 3-5 DAQPad-6507/6508 User Manual

Chapter 3 Signal Connections

CPC7

CPC6

CPC5
CPC4

CPC3

CPC2
CPC1
CPC0

CPB7

CPB6

CPB5

CPB4

CPB3

CPB2

CPB1
CPB0
CPA7

CPA6
CPA5

CPA4
CPA3
CPA2
CPA1
CPA0

+5 V

12
34
56
78

910
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
41 42
43 44
45 46
47 48
49 50

DPC7
DPC6
DPC5
DPC4
DPC3
DPC2
DPC1
DPC0

DPB7
DPB6

DPB5
DPB4
DPB3
DPB2
DPB1
DPB0
DPA7
DPA6
DPA5
DPA4
DPA3
DPA2
DPA1
DPA0
GND

Figure 3-4. Cable Assembly Connector Pin Assignments for Pins 51 through 100

of the DAQPad-6508 I/O Connector

DAQPad-6507/6508 User Manual 3-6

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National Instruments Corporation

Digital I/O Signal Connections

Pins 1 through 48 and pins 51 through 98 of the I/O connector are digital
I/O signal pins. Figure 3-5 depicts signal connections for three typical
digital I/O applications.

Chapter 3 Signal Connections

+5 V

LED

+5 V

TTL Signal

Switch *

I/O Connector

41
43
45
47

67
69
71

73

+5 V

Front Switch

100 kΩ100 kΩ 100 kΩ 100 kΩ

PPI A

Port A

APA<3..0>

100 kΩ 100 kΩ 100 kΩ 100 kΩ

PPI C
Port B

CPB<7..4>

50, 100

GND

DAQPad-6507/6508

* Complex switch circuitry is not shown in order to simplify the figure.

Figure 3-5.

Digital I/O Connections

In Figure 3-5, PPI A, port A is configured for digital output, and PPI C,
port B is configured for digital input. Digital input applications include
receiving TTL signals and sensing external device states, such as the state
of the switch in Figure 3-5. Digital output applications include sending
TTL signals and driving external devices such as the LED shown in
Figure 3-5.

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National Instruments Corporation 3-7 DAQPad-6507/6508 User Manual