National Instruments DAQPad-6508, DAQPad-6507 User Manual

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DAQPad™-6507/6508

User Manual

Digital I/O Devices for USB

DAQPad-6507/6508 User Manual

December 1998 Edition

Part Number 321724B-01

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Internet Support

E-mail: support@natinst.com FTP Site: ftp.natinst.com Web Address: http://www.natinst.com

Bulletin Board Support

BBS United States: 512 794 5422 BBS United Kingdom: 01635 551422 BBS France: 01 48 65 15 59

Fax-on-Demand Support

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Tel: 512 795 8248 Fax: 512 794 5678

International Offices

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National Instruments Corporate Headquarters

6504 Bridge Point Parkway Austin, Texas 78730-5039 USA Tel: 512 794 0100

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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

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

. C

. This limitation of the liability of

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.

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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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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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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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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.

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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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About This Manual

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.

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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.

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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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 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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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.

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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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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.

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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.

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

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

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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.

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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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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

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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.

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

Page 22

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

01234567

APA

APC

liable for any damages resulting from

not

BPA

01234567

BPB

01234567

BPC

01234567

CPA

01234567

Figure 3-1.

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

1234567

CPB

01234567

CPC

Screw Terminal Assignments for the DAQPad-6507

01234567

DPA

DPB

DPC

Page 23

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

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National Instruments Corporation

Page 24

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.

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

Page 25

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

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

STBA* INTRAI/O I/O I/O

* 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.

DAQPad-6507/6508 User Manual 3-4

National Instruments Corporation

Page 26

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

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

Page 27

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

National Instruments Corporation

Page 28

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

+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.

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

Page 29

Chapter 3 Signal Connections

Power Connections

Two pins on the I/0 connector supply +5 V from your DAQPad device’s power supply through a self-resetting fuse. The fuse resets automatically within a few seconds after the overcurrent condition is removed. These two pins are referenced to DGND and can be used to power external digital circuitry.The power rating is indicated below.

Power rating: +4.65 VDC to +5.25 VDC at 1 A combined total for both pins

Caution

Never connect the +5 V power pins (pins 49 and 99) directly to analog or digital ground or to any other voltage source on your DAQP ad device or any other device. Doing so can damage your DAQ Pad device and the computer. National Instruments is not liable for damages resulting from such a connection.

Pins 49 and 99 of the I/O connector are connected to the +5 V supply of the DAQPad-6507/6508 devices. You can power the DAQPad-6507 or DA QPad-6508 from either USB power or an e xternal source. The D A QPad uses USB power when the external source is not plugged in. USB power limits any device from using more than 0.5 A. If you are running from USB power (that is, if your external power source is not plugged in), you have only 150 mA to drive signals and supply power for your circuitry. If you require more power than 150 mA, attach the external power source. Also, your host computer might turn off power to your DAQPad device if no activity is detected. This cuts the power to any external circuitry powered by your DAQPad device if you are not using an external power source. Refer to Power Considerations, in Chapter 2, Installation and

Configuration, of this manual.

Connecting Power Sources to Digital I/O Lines

Caution

Always turn your DAQPad on before applying external power to the digital I/O (DIO) lines. If your DA QP ad is off and external power is applied to the DIO lines, your DAQPad may be damaged. National Instruments is not liable for damage caused by incorrect power sequencing.

When supplying power to DIO lines, we strongly recommend you use the +5 V source from the DAQPad. If you must use an external power source, it is important to sequence the power correctly—DAQ Pad first, then external power—to prevent damage to the CMOS circuits. Because of a trait common to all CMOS circuits, applying external power first may cause current to flow incorrectly, damaging the circuit.

DAQPad-6507/6508 User Manual 3-8

National Instruments Corporation

Page 30

Digital I/O State Selection

You can power up the digital I/O lines for the DAQPad-6507/6508 devices in a user-defined state. The DAQPad-6507/6508 devices facilitate user-configurable pull-up or pull -down tasks. Each DIO channel is connected to a 100 kΩ resistor and can be pulled high or low using the front panel switch. You can use this switch to pull all 96 DIO lines high or low, or you can allow the lines to float. However, if all lines are high, you might want to pull some lines low. To do this properly, you must understand the nature of the drive current on those lines and adhere to TTL logic levels, or you can let the lines float and tie them all high or low as necessary.

High DIO State

If you select the pulled-high mode, each DIO line will be pulled to VCC (+5 VDC) with a 100 kΩ resistor. To pull a specific line low, connect between that line and ground and use a pull-down resistor (R will give you a maximum of 0.4 VDC. The DIO lines provide a maximum of 2.5 mA at 3.7 V in the high state. Use the largest possible resistor so that you do not use more current than necessary to perform the pull-down task.

Also, make sure the resistor value is not so large that leakage current from the DIO line along with the current from the 100 kΩ pull-up resistor drives the voltage at the resistor above a TTL low level of 0.4 VDC.

Chapter 3 Signal Connections

) whose value

DAQPad-6507/6508

82C55A

Figure 3-6.

National Instruments Corporation 3-9 DAQPad-6507/6508 User Manual

DIO Channel Configured for High DIO State with External Load

100 kΩ

+5 V

GND

Digital I/O Line

Page 31

Chapter 3 Signal Connections

Example: At power up, the device is configured for input and, by default, all DIO lines are high. To pull one channel low, follow these steps:

1. Install a load (R

). Remember that the smaller the resistance, the

greater the current consumption and the lower the voltage (V).

2. Using the following formula, calculate the largest possible load to maintain a logic low level of 0.4 V and supply the maximum driving current (I).

V = I * R

⇒ RL = V / I, where:

V= 0.4 V is the voltage across R

I = 46 µA + 10 µA is the 4.6 V across the 100 kΩ pull-up resistor and 10 µA from 82C55 leakage current

Therefore:

= 7.1 kΩ is the 0.4 V / 56 µA

This resistor value, 7.1 kΩ, provides a maximum of 0.4 V on the DIO line at power up. You can substitute smaller resistor values, but they will draw more current, leaving less drive current for other circuitry connected to this line. The 7.1 kΩ resistor reduces the amount of a logic high source current by 0.4 mA with a 2.8 V output.

Low DIO State

If you select pulled-low mode, each DIO line will be pulled to GND (0 VDC) using a 100 kΩ resistor. If you want to pull a specific line high, connect a pull-up resistor that gives you a minimum of 2.8 VDC. The DIO lines are capable of sinking a maximum of 2.5 mA at 0.4 V in the low state. Use the largest possible resistance value so that you do not use more current than necessary to perform the pull-up task.

Also, make sure the pull-up resistor value is not so large that leakage current from the DIO line along with the current from the 100 kΩ pull-down resistor brings the voltage at the resistor below a TTL-high le vel of 2.8 VDC.

DAQPad-6507/6508 User Manual 3-10

National Instruments Corporation

Page 32

Chapter 3 Signal Connections

DAQPad-6507/6508

82C55A

100 kΩ

GND

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

+5 V

Digital I/O Line

Example: The switch is set in the low DIO state, which means all DIO lines are pulled low. If you want to pull one channel high, follow these steps:

1. Install a load (R

). Remember that the smaller the resistance, the

greater the current consumption and the lower the voltage (V).

2. Using the following formula, calculate the largest possible load to maintain a logic high level of 2.8 V and supply the maximum sink current (I).

V = I * R

⇒ RL = V / I, where:

V = 2.2 V is the voltage across R

I = 28 µA + 10 µA is the 2.8 V across the 100 kΩ pull-up resistor and 10 µA from 82C55A leakage current

Therefore:

= 5.7 kΩ is the 2.2 V / 38 µA

This resistor value, 5.7 kΩ, provides a minimum of 2.8 V on the DIO line at power up. You can substitute smaller resistor values but they draw more current, leaving less sink current for other circuitry connected to this line. The 5.7 kΩ resistor reduces the amount of a logic low sink current by

0.8 mA with a 0.4 V output.

Floating DIO State

The DIO lines are not pulled high or low by your DAQPad device in this configuration. Use an external 100 kΩ resistor to pull the line to the state you want.

National Instruments Corporation 3-11 DAQPad-6507/6508 User Manual

Page 33

Chapter 3 Signal Connections

Timing Specifications

This section lists the timing specifications for handshaking with the DAQPad-6507/6508 devices. The handshaking lines STB* and IBF synchronize input transfers. The handshaking lines OBF* and ACK* synchronize output transfers.

The signals in Table 3-3 are used in the timing diagrams later in this chapter.

Table 3-3.

Timing Signal Descriptions

Name Type Description

STB* Input Strobe Input—A low signal on this handshaking line loads data

into the input latch.

IBF Output Input Buffer Full—A high signal on this handshaking line indicates

that data has been loaded into the input latch. This is an input acknowledge signal.

ACK* Input Acknowledge Input—A low signal on this handshaking line

indicates that the data written to the port has been accepted. This signal is a response from the external device indicating that it has received the data from the DAQPad-6507/6508 devices.

OBF* Output Output Buffer Full—A low signal on this handshaking line

indicates that data has been written to the port.

INTR Output Interrupt Request—This signal becomes high when the 82C55A

requests service during a data transfer. The appropriate interrupt enable bits must be set to generate this signal.

RD* Internal Read Signal—This signal is the read signal generated from the

control lines of the computer I/O expansion bus.

WR* Internal Write Signal—This signal is the write signal generated from the

control lines of the computer I/O expansion bus.

DA T A Bidirectional Data Lines at the Specified Port—This signal indicates the

availability of data on the data lines at a port that is in the output mode. If the port is in the input mode, this signal indicates when the data on the data lines should be valid.

DAQPad-6507/6508 User Manual 3-12

National Instruments Corporation

Page 34

Mode 1 Input Timing

The following figure illustrates the timing specifications for an input transfer in mode 1.

STB *

Chapter 3 Signal Connections

IBF

INTR

RD *

DATA

Name Description Minimum Maximum

T1 STB* pulse width 100 — T2 STB* = 0 to IBF = 1 — 150 T3 Data before STB* = 1 20 — T4 STB* = 1 to INTR = 1 — 150 T5 Data after STB* = 1 50 — T6 RD* = 0 to INTR = 0 — 200 T7 RD* = 1 to IBF = 0 — 150

All timing values are in nanoseconds.

National Instruments Corporation 3-13 DAQPad-6507/6508 User Manual

Page 35

Chapter 3 Signal Connections

Mode 1 Output Timing

The following figure illustrates the timing specifications for an output transfer in mode 1.

WR*

OBF*

INTR

ACK*

DATA

Name Description Minimum Maximum

T1 WR* = 0 to INTR = 0 — 250 T2 WR* = 1 to output — 200 T3 WR* = 1 to OBF* = 0 — 150 T4 ACK* = 0 to OBF* = 1 — 150 T5 ACK* pulse width 100 — T6 ACK* = 1 to INTR = 1 — 150

All timing values are in nanoseconds.

DAQPad-6507/6508 User Manual 3-14

National Instruments Corporation

Page 36

Mode 2 Bidirectional Timing

The following figure illustrates the timing specifications for bidirectional transfers in mode 2.

Chapter 3 Signal Connections

WR *

OBF *

INTR

ACK *

STB *

T10

IBF

RD *

DATA

Name Description Minimum Maximum

T1 WR* = 1 to OBF* = 0 — 150 T2 Data before STB* = 1 20 — T3 STB* pulse width 100 — T4 STB* = 0 to IBF = 1 — 150 T5 Data after STB* = 1 50 — T6 ACK* = 0 to OBF = 1 — 150 T7 ACK* pulse width 100 — T8 ACK* = 0 to output — 150 T9 ACK* = 1 to output float 20 250

T10 RD* = 1 to IBF = 0 — 150

All timing values are in nanoseconds.

National Instruments Corporation 3-15 DAQPad-6507/6508 User Manual

Page 37

Chapter

Theory of Operation

This chapter contains a functional overview of the DAQPad-6507/6508 devices and explains the operation of each functional unit making up the DAQPad-6507 or DAQPad-6508.

The block diagram in Figure 4-1 illustrates the key functional components of the DAQPad-6507/6508 devices.

Configuration Port

Data

USB Interface

Power Supply

Controls

Power Supply

Controls

Serial

Configuration

EEPROM

Serial EEPROM

USB Microcontroller

Intel 8x930AX

Serial Port

Interface

External Power

5 V Supply

Power Supply

Switch

Interrupt Request

Bus

Interface

Firmware EEPROM

Power Supply

Controls

Wait State

Controls

Address/Data

FPGA

SRAM

Interrupt Controls

Address/Data

Bus

Address/Data

Control Lines

Address/Data

Control Lines Control Lines

Address/Data

Control Lines

Address/Data

+5 V

500 mA

82C55

PPI (A)

82C55

PPI (B)

6 6

82C55

PPI (C)

82C55

PPI (D)

82C53 Timer

Port A Port B Port C

Port A Port B

Port C

Port A Port B

Port C

Port A Port B

Port C

8 8 8

8 8

Terminal Blocks (100 POS)

8 8 8

Figure 4-1.

National Instruments Corporation 4-1 DAQPad-6507/6508 User Manual

DAQPad-6507/6508 Devices Block Diagram

Page 38

Chapter 4 Theory of Operation

Interrupt Control Circuitry

Interrupt control circuitry enables and disables interrupts. Two software-controlled registers determine which devices, if any, generate interrupts in the interrupt circuitry of the DAQPad-6507/6508 devices. Each of the four 82C55A devices has two interrupt lines, PC3 and PC0, connected to the interrupt circuitry.

Each of the eight interrupt lines can interrupt the host computer if the interrupt circuitry is enabled and the corresponding enable bit is set. Normally, PC3 and/or PC0 of the 82C55A devices are controlled by the handshaking circuitry; however, you can configure and use either of these two lines for input and external interrupts. An interrupt occurs on the low-to-high transition of the signal line. Refer to Appendix B, OKI 82C55A

Data Sheet for more information.

USB Microcontroller

The USB controller is a special microcontroller that has circuitry necessary to transmit and receive data over USB itself. It maintains information about the status of the bus and follows the USB protocol to acquire and send information over the bus. The microcontroller receives instruction codes over USB, parses the instructions, and executes them. NI-DAQ handles all interaction with the microcontroller.

82C55A Programmable Peripheral Interface

The four 82C55A PPI chips are the heart of the DAQPad-6507/6508 devices. Each of these chips has 24 programmable I/O pins that represent three 8-bit ports: PA, PB, and PC. Each port can be programmed as an input or an output port. The 82C55A has three modes of operation: simple I/O (mode 0), strobed I/O (mode 1), and bidirectional I/O (mode 2). In modes 1 and 2, the three ports are divided into two groups: group A and group B. Each group has eight data bits and four control and status bits from port C (PC). Modes 1 and 2 use handshaking signals from port C to synchronize data transfers. Refer to Appendix B, OKI 82C55A Data Sheet, for more detailed information.

DAQPad-6507/6508 User Manual 4-2

National Instruments Corporation

Page 39

Digital I/O Connector

All digital I/O is transmitted through a standard, 100-pin, female connector for the DAQPad-6508 or 100-pin screw terminal with a strain-relief clamp for the DAQPad-6507. Pins 49 and 99 are connected to +5 V through a self-restarting protection fuse (F1). See Figure 4-1 for its location. This +5 V supply is often required to operate I/O module mounting racks. Pins 50 and 100 are connected to ground. See the Optional Equipment section in Chapter 1, Introduction, as well as Chapter 2, Installation and

Configuration, and the Digital I/O Signal Connections section in

Chapter 3, Signal Connections, for additional in formation.

Chapter 4 Theory of Operation

National Instruments Corporation 4-3 DAQPad-6507/6508 User Manual

Page 40

Appendix

Specifications

This appendix lists the specifications of the DAQPad-6507/6508 devices. These specifications are typical at 25° C, unless otherwise stated. The operating temperature range is 0° to 70° C.

Digital I/O

Number of channels...............................96 I/O

Compatibility .........................................TTL

Absolute max voltage rating..................–0.5 to +5.5 V with respect

Handshaking...........................................Requires 1 port

Power-on state........................................Configured as inputs, high

Data transfers .........................................Interrupts, programmed I/O

to GND

(selectable on the front panel switch)

Digital logic levels

Level Min Max

Input low voltage Input high voltage Input low current (V Input high current (V

Output low voltage (I Output high voltage (I

Input current (0 < Vin < 5 V) –1.0 µA 1.0 µA

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

= 0.8 V)

= 2.4 V)

= 2.5 mA)

out

= -2.5 mA)

out

–0.3 V

2.2 V — —

0 V

3.7 V

0.8 V

5.3 V

–1.0 µA

1.0 µA

0.4 V

5.0 V

Page 41

Appendix A Specifications

Output signals

Pin 49 and pin 99 (at +5 V).............0.5 A max

Note The total combined current output from pins 49 and 99 may be limited by the

available current from the USB. If you do not have the external power supply connected, you have only 150 mA of current available to drive all outputs, including DIO lines.

Transfer rates..........................................Up to 60 S/s

Power Requirement

External

9 to 30 VDC.....................................12 W max

USB

4.40 to 5.25 VDC.............................220 mA typ, 500 mA max

Physical

Dimensions.............................................22.9 by 14.6 cm (9.0 by 5.7 in.)

I/O connector

DAQPad-6507................................ .100-screw terminals

DAQPad-6508.................................100-pin female, 0.050 series

D-type

Environment

Operating temperature............................0° to 70° C

Storage temperature................................–55° to 150° C

Relative humidity ...................................5% to 90% noncondensing

DAQPad-6507/6508 User Manual A-2

National Instruments Corporation

Page 42

Appendix

OKI 82C55A Data Sheet

This appendix contains the manufacturer data sheet for the OKI 82C55A interface. This interface is used on the DAQPad-6507/6508 devices.

(OKI Semiconductor) CMOS programmable peripheral

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

Microprocessor,

Seventh Edition, March 1993

Page 43

Appendix B OKI 82C55A Data Sheet

DAQPad-6507/6508 User Manual B-2

National Instruments Corporation

Page 44

Appendix B OKI 82C55A Data Sheet

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

Page 45

Appendix B OKI 82C55A Data Sheet

DAQPad-6507/6508 User Manual B-4

National Instruments Corporation

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Appendix B OKI 82C55A Data Sheet

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Appendix B OKI 82C55A Data Sheet

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Appendix

Common Questions

This appendix contains a list of commonly asked questions and their answers relating to usage and special features of your DAQP ad-6507/6508 devices.

General Information

What are DAQPad-6507/6508 devices?

The DAQPad-6507/6508 devices are USB platform, 96-line DIO devices.

What type of 5 V protection do the DAQPad-6507/6508 devices have?

The DAQPad-6507/6508 devices have 5 V lines equipped with a self-resetting 1 A fuse.

Installation and Configuration

How do I know if my version of Windows supports USB?

Look in the tab should list a Controller and a USB root hub. If your computer has this and also USB ports, your machine is supported. If your computer has USB ports but no controller is listed in the software.

System

properties in the control panel. The

Universal Serial Bus Controller

Device Manager

along with a USB

, you might need to upgrade your

What is the best way to test my device without having to program the device?

If you are using Windows, the NI-DAQ Configuration Utility has a menu with some excellent tools for doing simple functional tests of the device, such as analog input and output, digital I/O, and counter/timer tests.

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

Test

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Appendix C Common Questions

Digital I/O

What does the blink pattern mean for the configuration LED on the front panel?

This LED blinks to indicate the status of the DAQPad-6507/6508 devices. It also can indicate an error through a blink code. Refer to Table 2-1 for more information.

What are the power-on states of the PPI and DIO lines on the I/O connector?

At system power-on and reset, both the PPI and DIO lines are set to high impedance by the hardware. This means that the device circuitry is not actively driving the output either high or low. However, these lines may have pull-up or pull-down resistors connected to them as shown in the

Digital I/O State Selection section in Chapter 3, Signal Connections. These

resistors weakly pull the output to either a logic high or logic low state.

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Appendix

Customer Communication

For your convenience, this appendix contains forms to help you gather the information necessary to help us solve your technical problems and a form you can use to comment on the product documentation. When you contact us, we need the information on the Technical Support Form and the configuration form, if your manual contains one, about your system configuration to answer your questions as quickly as possible.

National Instruments has technical assistance through electronic, fax, and telephone systems to quickly provide the information you need. Our electronic services include a bulletin board service, an FTP site, a fax-on-demand system, and e-mail support. If you have a hardware or software problem, first try the electronic support systems. If the information available on these systems does not answer your questions, we offer fax and telephone support through our technical support centers, which are staffed by applications engineers.

Electronic Services

Bulletin Board Support

National Instruments has BBS and FTP sites dedicated for 24-hour support with a collection of files and documents to answer most common customer questions. From these sites, you can also download the latest instrument drivers, updates, and example programs. For recorded instructions on how to use the bulletin board and FTP services and for BBS automated information, call 512 795 6990. You can access these services at:

United States: 512 794 5422

Up to 14,400 baud, 8 data bits, 1 stop bit, no parity

United Kingdom: 01635 551422

Up to 9,600 baud, 8 data bits, 1 stop bit, no parity

France: 01 48 65 15 59

Up to 9,600 baud, 8 data bits, 1 stop bit, no parity

FTP Support

To access our FTP site, log on to our Internet host, ftp.natinst.com, as anonymous and use your Internet address, such as documents are located in the

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

joesmith@anywhere.com, as your password. The support files and

/support directories.

Page 62

Fax-on-Demand Support

Fax-on-Demand is a 24-hour information retrieval system containing a library of documents on a wide range of technical information. You can access Fax-on-Demand from a touch-tone telephone at 512 418 1111.

E-Mail Support (Currently USA Only)

You can submit technical support questions to the applications engineering team through e-mail at the Internet address listed below . Remember to include your name, address, and phone number so we can contact you with solutions and suggestions.

support@natinst.com

Telephone and Fax Support

National Instruments has branch offices all over the world. Use the list below to find the technical support number for your country. If there is no National Instruments office in your country, contact the source from which you purchased your software to obtain support.

Country Telephone Fax

Australia 03 9879 5166 03 9879 6277 Austria 0662 45 79 90 0 0662 45 79 90 19 Belgium 02 757 00 20 02 757 03 11 Brazil 011 288 3336 011 288 8528 Canada (Ontario) 905 785 0085 905 785 0086

Québec

Canada ( Denmark 45 76 26 00 45 76 26 02 Finland 09 725 725 11 09 725 725 55 France 01 48 14 24 24 01 48 14 24 14 Germany 089 741 31 30 089 714 60 35 Hong Kong 2645 3186 2686 8505 Israel 03 6120092 03 6120095 Italy 02 413091 02 41309215 Japan 03 5472 2970 03 5472 2977 Korea 02 596 7456 02 596 7455 Mexico 5 520 2635 5 520 3282 Netherlands 0348 433466 0348 430673 Norway 32 84 84 00 32 84 86 00 Singapore 2265886 2265887 Spain 91 640 0085 91 640 0533 Sweden 08 730 49 70 08 730 43 70 Switzerland 056 200 51 51 056 200 51 55 Taiwan 02 377 1200 02 737 4644 United Kingdom 01635 523545 01635 523154 United States 512 795 8248 512 794 567 8

) 514 694 8521 514 694 4399

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Technical Support Form

Photocopy this form and update it each time you make changes to your software or hardware, and use the completed copy of this form as a reference for your current configuration. Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently.

If you are using any National Instruments hardware or software products related to this problem, include the configuration forms from their user manuals. Include additional pages if necessary.

Name __________________________________________________________________________ Company _______________________________________________________________________ Address ________________________________________________________________________

______________________________________________________________________________ _ Fax ( ___ ) ________________Phone ( ___ ) __________________________________________ Computer brand____________ Mod el ___________________Processor _____________________ Operating system (include version number) ____________________________________________ Clock speed ______MHz RAM _____MB Display adapter __________________________ Mouse ___yes ___no Other adapters installed_______________________________________ Hard disk capacity _____MB Brand_________________________________________________ Instruments used _________________________________________________________________

______________________________________________________________________________ _ National Instruments hardware product model_____________ Revision ____________________ Configuration ________________________________ ___________________________________ National Instruments software product ___________________ Version _____________________ Configuration ________________________________ ___________________________________ The problem is: __________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________ List any error messages: ___________________________________________________________

______________________________________________________________________________ _

______________________________________________________________________________ _ The following steps reproduce the problem: ___________________________________________

______________________________________________________________________________ _

Page 64

DAQPad-6507/6508 Hardware and Software Configuration Form

Record the settings and revisions of your hardware and software on the line to the right of each item. Complete a new copy of this form each time you re vise your softw are or hardw are configuration, and use this form as a reference for your current configuration. Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently.

National Instruments Products

DAQ hardware __________________________________________________________________ Interrupt level of hardware _________________________________________________________ Base I/O address of hardware _______________________________________________________ Programming choice ____________________________________ _________________________ NI-DAQ, LabVIEW, or LabWindows/CVI version ______________________________________ Other boards in system _____________________ _______________________________________ Base I/O address of other boards ________________________ ___ ___ ____ __________________ DMA channels of other boards _________________________________________________ ____ Interrupt level of other boards ______________________________________________________

Other Products

Computer make and model ________________________________________________________ Microprocessor ______________________________________ ____________________________ Clock frequency or speed __________________________________________________________ Type of video board installed _________________________________ ______________________ Operating system version __________________________________________________________ Operating system mode ___________________________________________________________ Programming language __________________________________ _________________________ Programming language version _____________________________________________________ Other boards in system _____________________ _______________________________________ Base I/O address of other boards ________________________ ___ ___ ____ __________________ DMA channels of other boards _________________________________________________ ____ Interrupt level of other boards ______________________________________________________

Page 65

Documentation Comment Form

National Instruments encourages you to comment on the documentation supplied with our products. This information helps us provide quality products to meet your needs.

Title:

DAQPad™-6507/6508 User Manual

Edition Date:

Part Number:

Please comment on the completeness, clarity, and organization of the manual.

______________________________________________________________________________ _

______________________________________________________________________________ _ If you find errors in the manual, please record the page numbers and describe the errors.

______________________________________________________________________________ _

December 1998 321724B-01

Thank you for your help. Name _________________________________________________________________________ Title __________________________________________________________________________ Company _______________________________________________________________________ Address _____________________________________ ___________________________________

________________________________________ ______________________________________ _ E-Mail Address __________________________________________________________________ Phone ( ___ ) __________________________ Fax ( ___ ) _______________________________

Mail to:

Technical Publications National Instruments Corporation National Instruments Corporation 6504 Bridge Point Parkway 512 794 5678 Austin, Texas 78730-5039

Fax to:

Technical Publications

Page 66

Prefix Meanings Value

p- pico- 10 n- nano- 10 µ- micro- 10

m- milli- 10

k- kilo- 10

M- mega- 10

G- giga- 10

Symbols/Numbers

Glossary

–12

–9

–6

–3

% percent ± plus or minus ° degrees /per + positive of, or plus – negative of, or minus Ω ohms

square root of

+5 V +5 VDC source signal

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Glossary

A amperes AC alternating current AC coupled allowing the transmission of AC signals while blocking DC signals ACH analog input chann e l signal ACK* acknowledge input signal A/D analog-to-digital address character code that identifies a specific location (or series of locations) in

memory AIRQ0 PPI A interrupt request bit for Port A AIRQ1 PPI A interrupt request bit for POrt B alias a false lower frequency component that appears in sampled data acquired

at too low a sampling rate ALU arithmetic logic unit—the element(s) in a processing system that

perform(s) the mathematical functions such as addition, subtraction,

multiplication, division, inversion, AND, OR, NAND, and NOR AMD Advanced Micro Devices ANSI American National Standards Institute APA bidirectional data lin es for Port A of PPI A APB bidirectional data lines for Port B of PPI A APC bidirectional data lines for Port C of PPI A ASIC application-specific integrated circuit asynchronous (1) hardware—a property of an event that occurs at an arbitrary time,

without synchronization to a reference clock (2) software—a property of

a function that begins an operation and returns prior to the completion or

termination of the operation

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Glossary

b bit—one binary digit, either 0 or 1 B byte—eight related bits of data, an eight-bit binary number. Also used to

denote the amount of memory required to store one byte of data.

bandwidth the range of frequencies present in a signal, or the range of frequencies to

which a measuring device can respond

base address a memory address that serves as the starting address for programmable

registers. All other addresses are located by adding to the base address.

baud rate serial communications data transmission rate expressed in bits per second

(b/s) BCD binary-coded decimal binary a number system with a base of 2 BIOS basic input/output system or built-in operating system bipolar a signal range that includes both positive and negativ e values (for example,

–5 V to +5 V) BIRQ0 PPI B interrupt request bit for Port A BIRQ1 PPI B interrupt request bit for Port B BNC a type of coaxial signal connector BPA bidirectional data lines for Port A of PPI B BPB bidirectional data lines for Port B of PPI B BPC bidirectional data lines for Port C of PPI B break-before-make a type of switching contact that is completely disengaged from one terminal

before it connects with another terminal breakdown voltage the voltage high enough to cause breakdown of optical isolation,

semiconductors, or dielectric materials. See also working voltage. buffer temporary storage for acquired or generated data (software)

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Glossary

burst-mode a high-speed data transfer in which the address of the data is sent followed

by back-to-back data words while a physical signal is asserted

bus the group of conductors that interconnect individual circuitry in a computer.

Ty pically, a bus is the expansion vehicle to which I/O or other devices are connected. Examples of PC buses are the AT bus, NuBus, Micro Channel, and EISA bus.

bus master a type of a plug-in board or controller with the ability to read and write

devices on the computer bus

C Celsius channel pin or wire lead to which you apply or from which you read the analog or

digital signal. Analog signals can be single-ended or differential. For digital signals, you group channels to form ports. Ports usually consist of either four or eight digital channels.

channel clock the clock controlling the time interv al between individual channel sampling

within a scan. Boards with simultaneous sampling do not have this clock. chromatograph an instrument used in chemical analysis of gases and liquids. CI computing index circuit trigger a condition for starting or stopping clocks CIRQ0 PPI C interrupt request bit for Port A CIRQ1 PPI C interrupt request bit for Port B clock hardware component that controls timing for reading from or writing to

groups CMOS complementary met a l-o xide semiconductor coupling the manner in which a signal is connected from one location to another CPA bidirectional lines for Port A of PPI C CPB bidirectional lines for Port A of PPI C

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Glossary

CPC bidirectional lines for Port A of PPIC CPU central processing unit crosstalk an unwanted signal on one channel due to an input on a diff eren t channel CTR1 counter 1 enable bit CTRIRQ counter interrupt enable bit current drive capability the amount of current a digital or analog output channel is capable of

sourcing or sinking while still operating within voltage range specifications

current sinking the ability of a DAQ board to dissipate current for analog or digital output

signals

current sourcing the ability of a DAQ board to supply current for analog or digital output

signals

DAC digital-to-analog converter—an electronic device, often an integrated

circuit, that converts a digital number into a corresponding analog voltage or current

daisy-chain a method of propagating signals along a bus, in which the devices are

prioritized on the basis of their position on the bus

DAQ data acquisition—(1) collecting and measuring electrical signals from

sensors, transducers, and test probes or fixtures and inputting them to a computer for processing; (2) collecting and measuring the same kinds of electrical signals with A/D and/or DIO boards plugged into a computer, and possibly generating control signals with D/A and/or DIO boards in the

same computer DATA data lines at the specified port signal DC direct current DC coupled allowing the transmission of both AC and DC signals

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Glossary

DCS distributed control system—a large-scale process control system

characterized by a distributed network of processors and I/O subsystems that encompass control, user interfacing, data collection, and system management. DCSs are commonly used in large industrial facilities, such as a petroleum refinery or paper mill.

default setting a default parameter v alue recorded in the driv er. In many cases, the default

input of a control is a certain value (often 0) that means use the current

default setting. For example, the default input for a parameter may be do not change current setting, and the default setting may be no AMUX-64T boards. If you do change the value of such a parameter, the new value

becomes the new setting. You can set default settings for some parameters in the configuration utility or manually using switches located on the device.

device a plug-in DAQ board, card, or pad that can contain multiple channels and

conversion devices. Plug-in boards, PCMCIA cards, and devices such as the DAQPad-1200, which connects to your computer parallel port, are all examples of DAQ devices. SCXI modules are distinct from devices, with

the exception of the SCXI-1200, which is a hybrid. DGND digital ground signal digital port See port. digital trigger a TTL level signal having two discrete levels—a high and a low level DIN Deutsche Industrie Norme DIO digital input/output DIP dual inline package DIRQ0 PPI D interrupt request bit for Port A DIRQ1 PPI D interrupt request bit for Port B DMA direct memory access DNL differential nonlinearity DOS disk operating system downstream the direction of data flow from the host computer or away from the host

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Glossary

DPA bidirectional data lin es for Port A of PPI D DPB bidirectional data lines for Port B of PPI D DPC bidirectional data lines for Port C of PPI D DRAM dynamic RAM drivers software that controls a specific hardware de vice such as a DAQ board or a

GPIB interface board DSP digital signal processi ng dual-access memory memory that can be sequentially accessed by more than one controller or

processor but not simultaneously accessed. Also known as shared memory. dual-ported memory memory that can be simultaneously accessed by more than one controller

or processor dynamic range the ratio of the largest signal level a circuit can handle to the smallest signal

level it can handle (usually taken to be the noise level), normally expressed

in decibels

ECL emitter-coupled logic EEPROM electrically erasable programmable read-only memory EGA enhanced graphics adapter EISA Extended Industry Standard Architecture EMC electromechanical compliance EPROM erasable programmable read-only memory—ROM that can be erased

(usually by ultraviolet light exposure) and reprogrammed event the condition or state of an analog or digital signal expansion ROM an onboard EEPROM that may contain device-specific initialization and

system boot functionality external trigger a voltage pulse from an external source that triggers an event such as A/D

conversion

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Glossary

false triggering triggering that occurs at an unintended time fetch-and-deposit a data transfer in which the data bytes are transferred from the source to the

controller, and then from the controller to the target FIFO first-in-first-out floating signal sources signal sources with voltage signals that are not connected to an absolute

reference or system ground. Also called nonreferenced signal sources.

Some common example of floating signal sources are batteries,

transformers, or thermocouples. flyby a type of high-performance data transfer in which the data bytes pass

directly from the source to the target without being transferred to the

controller ft feet

GND ground GPIB General Purpose Interface bus, synonymous with HP-IB. The standard bus

used for controlling electronic instruments with a computer. Also called

IEEE 488 bus because it is defined by ANSI/IEEE Standards 488-1978,

488.1-1987, and 488.2-1987.

rms

level of random vibration ground tie point the location where two or more grounds (such as digital ground, analog

output ground, analog input ground, and so on), are connected or tied

together grounded measurement

See referenced single-ended measurement system. system

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Glossary

h hour half-power bandwidth the frequency range over which a circuit maintains a le vel of at least –3 dB

with respect to the maximum level

handle pointer to a pointer to a block of memory; handles reference arrays and

strings. An array of strings is a handle to a block of memory containing handles to strings.

handler a device driver that is installed as part of the operating system of the

computer

handshaked digital I/O a type of digital acquisition/generation where a device or module accepts

or transfers data after a digital pulse has been received. Also called latched digital I/O.

hardware the physical components of a computer system, such as the circuit boards,

plug-in boards, chassis, enclosures, peripherals, cables, and so on

hardware triggering a form of triggering where you set the start time of an acquisition and gather

data at a known position in time relative to a trigger signal hex hexadecimal host the host computer system where the Universal Serial Bus host controller is

installed Hz hertz

IBF input buffer full signal IBFA input buffer bit for Port A IBFB input buffer bit for Port B IBM International Business Machines IC integrated circuit ID identification

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Glossary

IDE integrated development environment IEEE Institute of Electrical and Electronics Engineers IEEE 488 the shortened notation for ANSI/IEEE Standards 488-1978, 488.1-1987,

and 488.2-1987. See also GPIB.

immediate digital I/O a type of digital acquisition/generation where LabVIEW updates the digital

lines or port states immediately or returns the digital value of an input line.

Also called nonlatched digital I/O. in. inches Industrial Device

Networks

standardized digital communications networks used in industrial

automation applications; they often replace vendor-proprietary networks so

that devices from different vendors can communicate in control systems INL integral nonlinearity—a measure in LSB of the worst-case deviation from

the ideal A/D or D/A transfer characteristic of the analog I/O circuitry input bias current the current that flows into the inputs of a circuit input impedance the measured resistance and capacitance between the input terminals of a

circuit input offset current the difference in the input bias currents of the two inputs of an

instrumentation amplifier instrument driver a set of high-level software functions that controls a specific GPIB, VXI, or

RS-232 programmable instrument or a specific plug-in DAQ board.

Instrument drivers are available in several forms, ranging from a function

callable language to a virtual instrument (VI) in LabVIEW. instrumentation

amplifier

a circuit whose output voltage with respect to ground is proportional to the

difference between the voltages at its two inputs INTE1 interrupt enable bit for Port A output interrupts INTE2 interrupt enable bit for Port A input interrupts INTEA interrupt enable bit for Port A INTEB interrupt enable bit for Port B integral control a control action that eliminates the offset inherent in proportional control

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Glossary

INTEN global interrupt enable bit interrupt a computer signal indicating that the CPU should suspend its current task

to service a designated activity interrupt level the relative priority at which a device can interrupt interval scanning scanning method where there is a longer interval between scans than there

is between individual channels comprising a scan INTR interrupt request signal INTRA interrupt request status bit for Port A INTRB interrupt request status bit for Port B I/O input/output I

current, output high

current, output low IRQ interrupt request ISA Industry Standard Architecture isolation a type of signal conditioning in which you isolate the transducer signals

from the computer for safety purposes. This protects you and your

computer from large voltage spikes and makes sure the measurements from

the DAQ device are not affected by differences in ground potentials. isolation voltage the voltage that an isolated circuit can normally withstand, usually

specified from input to input and/or from any input to the amplifier output,

or to the computer bus isothermal constructed to maintain constant temperature across area. Isothermal

construction of terminal blocks increases thermocouple measurement

accuracy.

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Glossary

k kilo—the standard metric prefix for 1,000, or 103, used with units of

measure such as volts, hertz, and meters

K kilo—the prefix for 1,024, or 2

, used with B in quantifying data or

computer memory

kbytes/s a unit for data transfer that means 1,000 or 10

bytes/s kS 1,000 samples Kword 1,024 words of memory

LabVIEW laboratory virtual instrument engineering workbench latched digital I/O a type of digital acquisition/generation where a device or module accepts

or transfers data after a digital pulse has been received. Also called

handshaked digital I/O. LED light-emitting diode library a f ile containing compiled object modules, each comprised of one of more

functions, that can be linked to other object modules that make use of these

functions. NIDAQMSC.LIB is a library that contains NI-DAQ functions.

The NI-DAQ function set is broken down into object modules so that only

the object modules that are relevant to your application are linked in, while

those object modules that are not relevant are not linked. listener a device on the GPIB that receives information from a T alker on the bus LSB least sign ificant bit

m meters

M (1) Mega, the standard metric prefix for 1 million or 10

units of measure such as volts and hertz; (2) mega, the prefix for 1,048,576,

, when used with B to quantify data or computer memory

or 2

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Glossary

MB megabytes of memory MBLT eight-byte block transfers in which both the Address bus and the Data bus

are used to transfer data

Mbytes/s a unit for data transfer that means 1 million or 10

bytes/s memory buffer See buffer. MFLOPS million floating-point operations per second—the unit for expressing the

computational power of a processor MIO multifunctio n I/O MIPS million instructions per second—the unit for expressing the speed of

processor machine code instructions MITE MXI Interfaces to Everything is a custom ASIC designed by National

Instruments that implements the PCI bus interface. The MITE supports bus

mastering for high speed data transfers over the PCI bus. MS million samples MSB most significant bit MTBF mean time between failure multiplexed mode an SCXI operating mode in which analog input channels are multiplexed

into one module output so that your cabled DAQ device has access to the

module’s multiplex ed output as well as the outputs on all other multiplexed

modules in the chassis through the SCXI bus. Also called serial mode. mux multiplexer—a switching device with multiple inputs that sequentially

connects each of its inputs to its output, typically at high speeds, in order to

measure several signals with a single analog input channel

NB NuBus—a slot-dependent, 32-bit bus type used in Macintosh computers

that has 32 interrupts NC normally closed, or not connected NI-DAQ National Instruments driver software for DAQ hardware

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Glossary

NIST National Institute of Standards and Technology nodes execution elements of a block diagram consisting of functions, structures,

and subVIs

noise an undesirable electrical signal—Noise comes from external sources such

as the AC power line, motors, generators, transformers, fluorescent lights, soldering irons, CR T displays, computers, electrical storms, welders, radio transmitters, and internal sources such as semiconductors, resistors, and capacitors. Noise corrupts signals you are trying to send or receive.

nonlatched digital I/O a type of digital acquisition/generation where LabVIEW and NI-DAQ

updates the digital lines or port states immediately or returns the digital value of an input line. Also called immediate digital I/O or non-handshaking.

nonreferenced signal sources

signal sources with voltage signals that are not connected to an absolute reference or system ground. Also called floating signal sources. Some common examples of nonreferenced signal sources are batteries, transformers, or thermocouples.

OBF* output buffer full signal OBFA* output buffer bit for Port A OBFB* output buffer bit for Port B onboard channels channels provided by the plug-in data acquisition board onboard RAM optional RAM usually installed into SIMM slots OpenDoc a compound document architecture created by the joining of several

technologies supplied by Apple (the base OpenDoc architecture, the Bento file system and the Open Scripting Architecture) and IBM (the System Object Model)

operating system base-level software that controls a computer, runs programs, interacts with

users, and communicates with installed hardware or peripheral devices

optical coupler a device designed to transfer electrical signals by utilizing light waves

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Glossary

optical isolation the technique of using an optoelectric transmitter and receiver to transfer

data without electrical continuity, to eliminate high-potential differences

and transient signals optocoupler to provide coupling with electrical isolation between input and output.

Sometimes called optoisolator or photocoupler. OUT output output settling time the amount of time required for the analog output voltage to reach its final

value within specified limits output slew rate the maximum rate of change of analog output voltage from one level to

another

packet a bundle of data organized in a group for transmission parallel mode a type of SCXI operating mode in which the module sends each of its input

channels directly to a separate analog input channel of the device to the

module passband the range of frequencies which a device can properly propagate or measure pattern generation a type of handshaked (latched) digital I/O in which internal counters

generate the handshaked signal, which in turn initiates a digital transfer.

Because counters output digital pulses at a constant rate, this means you

can generate and retrieve patterns at a constant rate because the handshaked

signal is produced at a constant rate. PC personal computer PC Card a credit-card-sized expansion card that fits in a PCMCIA slot, often referred

to as a PCMCIA card PCI Peripheral Component Interconnect—a high-performance expansion bus

architecture originally developed by Intel to replace ISA and EISA. It is

achieving widespread acceptance as a standard for PCs and workstations;

it offers a theoretical maximum transfer rate of 132 Mbytes/s.

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Glossary

PCMCIA an expansion bus architecture that has found widespread acceptance as a de

facto standard in notebook-size computers. It originated as a specification

for add-on memory cards written by the Personal Computer Memory Card

International Association. PFI P rogrammable Function Input photoelectric sensor an electrical device that responds to a change in the intensity of the light

falling upon it pipeline a high-performance processor structure in which the completion of an

instruction is broken into its elements so that several elements can be

processed simultaneously from different instructions PLC programmable logic controller—a highly reliable special-purpose

computer used in industrial monitoring and control applications. PLCs

typically have proprietary programming and networking protocols, and

special-purpose digital and analog I/O ports. Plug and Play devices devices that do not require DIP switches or jumpers to configure resources

on the devices—also called switchless devices Plug and Play ISA a specification prepared by Microsoft, Intel, and other PC-related

companies that will result in PCs with plug-in boards that can be fully

configured in software, without jumpers or switches on the boards PnP Plug and Play port (1) a communications connection on a computer or a remote controller (2)

a digital port, consisting of four or eight lines of digital input and/or output posttriggering the technique used on a DAQ board to acquire a programmed number of

samples after trigger conditions are met potentiometer an electrical device the resistance of which can be manually adjusted; used

for manual adjustment of electrical circuits and as a transducer for linear or

rotary position PPI programmable peripheral interface ppm parts per million pretriggering the technique used on a DAQ board to keep a continuous buf fer f illed with

data, so that when the trigger conditions are met, the sample includes the

data leading up to the trigger condition

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Glossary

propagation the transmission of a signal through a computer system propagation delay the amount of time required for a signal to pass through a circuit protocol the exact sequence of bits, characters, and control codes used to transfer

data between computers and peripherals through a communications

channel, such as the GPIB bus pts points pulsed output a form of counter signal generation by which a pulse is outputted when a

counter reaches a certain value

QuickTime Apple system software tools that make video presentation a standard part

of the Macintosh. Applications can use QuickTime to record and display

audio and video in the same way applications use system tools to generate

and display text and graphics.

RAM random-access memory RD* read signal real time a property of an event or system in which data is processed as it is acquired

instead of being accumulated and processed at a later time referenced signal sources signal sources with voltage signals that are referenced to a system ground,

such as the earth or a building ground. Also called grounded signal sources. resource locking a technique whereby a device is signaled not to use its local memory while

the memory is in use from the bus retry an acknowledge by a destination that signifies that the cycle did not

complete and should be repeated R

EXT

external resistance ribbon cable a flat cable in which the conductors are side by side

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rise time the difference in time between the 10% and 90% points of a system’s step

response

load resistance rms root mean square RTD resistive temperature device

s seconds S samples sample counter the clock that counts the output of the channel clock, in other words, the

number of samples taken. On boards with simultaneous sampling, this

counter counts the output of the scan clock and hence the number of scans. SCADA supervisory control and data acquisition—a common PC function in

process control applications, where programmable logic controllers (PLCs)

perform control functions but are monitored and supervised by a PC scan one or more analog or digital input samples. T ypically , the number of input

samples in a scan is equal to the number of channels in the input group. For

example, one pulse from the scan clock produces one scan which acquires

one new sample from every analog input channel in the group. SCANCLK scan clock signal scan clock the clock controlling the time interval between scans. On boards with

interval scanning support (for example, the AT-MIO-16F-5), th is clock

gates the channel clock on and off. On boards with simultaneous sampling

(for example, the EISA-A2000), this clock clocks the track-and-hold

circuitry . scan rate the number of scans per second. For example, a scan rate of 10 Hz means

sampling each channel 10 times per second. SCXI Signal Conditioning eXtensions for Instrumentation SE single-ended inputs shared memory See dual-access memory

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Glossary

signal conditioning the manipulation of signals to prepare them for digitizing signal divider performing frequency division on an external signal SIMM single in-line memory module SISOURCE SI counter clock signal SMB a type of miniature coaxial signal connector software trigger a programmed event that triggers an event such as data acquisition software triggering a method of triggering in which you simulate an analog trigger using

software. Also called conditional retrieval.

source impedance a parameter of signal sources that reflects current-driving ability of voltage

sources (lower is better) and the voltage-driving ability of current sources

(higher is better) SOURCE input pin an counter input pin where the counter counts the signal transitions SPDT single-pole double throw—a property of a switch in which one terminal can

be connected to one of two other terminals SS simultaneous sampling—a property of a system in which each input or

output channel is digitized or updated at the same instant S/s samples per second—used to express the rate at which a DAQ board

samples an analog signal STARTSCAN start scan signal STB strobe input signal STC system timing controller statically configured

device

a device whose logical address cannot be set through software; that is, it is

not dynamically configurable switchless device devices that do not require dip switches or jumpers to configure resources

on the devices—also called Plug and Play devices synchronous (1) hardware—a property of an event that is synchronized to a reference

clock (2) software—a property of a function that begins an operation and

returns only when the operation is complete

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Glossary

system RAM RAM installed on a personal computer and used by the operating system,

as contrasted with onboard RAM

system noise a measure of the amount of noise seen by an analog circuit or an ADC when

the analog inputs are grounded

TC terminal count T/H track-and-hold—a circuit that tracks an analog voltage and holds the v alue

on command

Theorem signal contains no frequency components higher than half the frequency at

which it is sampled, then the original signal can be recovered without distortion

throughput rate the data, measured in bytes/s, for a given continuous operation, calculated

to include software overhead. Throughput Rate = Transfer Rate Software Overhead Factor.

top-level VI VI at the top of the VI hierarchy . This term is used to distinguish the VI

from its subVIs.

transfer rate the rate, measured in bytes/s, at which data is moved from source to

destination after software initialization and set up operations; the maximum

rate at which the hardware can operate TRIG trigger signal trigger any event that causes or starts some form of data capture TTL transistor-transistor logic

UART universal asynchronous receiver/transmitter—an integrated circuit that

converts parallel data to serial data (and vice versa), commonly used as a

computer bus to serial device interface for serial communication UI update interval UISOURCE update interval counter clock signal

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unipolar a signal range that is always positive (for example, 0 to +10 V) update the output equivalent of a scan. One or more analog or digital output

samples. Typically, the number of output samples in an update is equal to the number of channels in the output group. For example, one pulse from the update clock produces one update which sends one new sample to every

analog output channel in the group. UPDATE update signal update rate the number of output updates per second upstream the direction data flow towards the host computer USB Universal Serial Bus

Vvolts

Glossary

+5 V power supply VDC volts direct current VDMAD virtual DMA driver V

EXT

external volt VI virtual instrument—(1) a combination of hardware and/or software

elements, typically used with a PC, that has the functionality of a classic

stand-alone instrument (2) a LabVIEW software module (VI), which

consists of a front panel user interface and a block diagram program V

volts, input high

volts, input low

volts in VISA a new driver software architecture developed by National Instruments to

unify instrumentation software for GPIB, DAQ, and VXI. It has been

accepted as a standard for VXI by the VXIplug&play Systems Alliance.

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Glossary

visual basic custom control (VBXs)

a specific form of binary packaged object that can be created by different companies and integrated into applications written using Visual Basic

volts, output high volts, output low

wire data path between nodes word the standard number of bits that a processor or memory manipulates at one

time. Microprocessors typically use 8-, 16-, or 32-bit words.

working voltage the highest voltage that should be applied to a product in normal use,

normally well under the breakdown voltage for safety margin. See also breakdown voltage.

WR* write signal

zero-overhead looping the ability of a high-performance processor to repeat instructions without

requiring time to branch to the beginning of the instructions

zero-wait-state memory memory fast enough that the processor does not have to wait during any

reads and writes to the memory

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Index

Numbers

+5 V signal (table), 3-3 82C55A Programmable Peripheral Interface

OKI 82C55A data sheet, B-1 to B-17 overview, 4-2

ACK* signal

description (table), 3-12 mode 1 output timing (figure), 3-14

mode 2 bidirectional timing (figure), 3-15 APA<7..0> sign al (tab le), 3-3 APB<7..0> signal (table), 3-3 APC<7..0> signal (table), 3-3

battery pack, BP-1 (note), 2-2 BPA<7..0> signal (table), 3-3 BPB<7..0> signal (table), 3-3 BPC<7..0> signal (table), 3-3 bulletin board support, D-1

cable assembly connectors, 3-4 to 3-6

custom cabling, 1-6

overview, 3-4

pin assignments

pins 1 through 50 (figure), 3-5

pins 51 through 100 (figure), 3-6 common questions, C-1 to C-2 ComponentWorks software, 1-3

configuration. See also installation.

common questions, C-1 to C-2

Plug and Play capability, 2-4 connecting power to digital I/O lines, 3-8 connectors. See cable assembly connectors; I/O

connector pin descriptions. CPA<7..0> signal (table), 3-3 CPB<7..0> signal (table), 3-3 CPC<7..0> signal (table), 3-3 custom cabling, 1-6 customer communication, xii, D-1toD-2

DAQPad-6507/6508 devices

block diagram, 4-1 common questions, C-1 to C-2 custom cabling, 1-6 driving SSR-OAC-5 and SSR-OAC-5A

output modules (note), 1-2 interfacing with PCs, 1-1 NI-DAQ driver software version required

(note), 2-1 optional equipment, 1-5 to 1-6 overview, 1-1to1-2 requirements for getting started, 1-2 software programming choices, 1-2 to 1-5

National Instruments application

software, 1-3

NI-DAQ driver software, 1-4 to 1-5 theory of operation, 4-1 to 4-3 unpacking, 1-6

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DA TA signal

description (table), 3-12 mode 1 input timing (figure), 3-13 mode 1 output timing (figure), 3-14 mode 2 bidirectional timing (figure), 3-15

digital I/O

questions and answers, C-2 specifications, A-1 to A-2

digital I/O connector

description, 4-3

signal connections, 3-7 digital I/O lines, connecting power to, 3-8 digital I/O state selection, 3-9 to 3-11

floating DIO state, 3-11

high DIO state, 3-9 to 3-10

low DIO state, 3-10 to 3-11 documentation

conventions used in manual, x

National Instruments documentation, xi

organization of manual, ix-x

related documentation, xii DPA<7..0> sign al (tab le), 3-3 DPB<7..0> signal (table), 3-3 DPC<7..0> signal (table), 3-3

e-mail support, D-2 electronic support services, D-1 to D-2 environment specifications, A-2 equipment, optional, 1-5 to 1-6

custom cabling, 1-6 exceeding maximum ratings (note), 3-1

fax and telephone support numbers, D-2 Fax-on-Demand support, D-2 floating DIO state, 3-11 FTP support, D-1 fuse, self-resetting, 3-8

GND signal (table), 3-3

hardware installation, 2-1 to 2-4

BP-1 battery pack (note), 2-2 LED patterns for DAQPad-6507/6508

states (table), 2-3 power connections (figure), 2-2 resistors for polarity selection (note), 2-3 sequence of instructions for proper

operation (note), 2-1 steps for, 2-2 upstream and downstream connections

(figure), 2-4

high DIO state, 3-9 to 3-10

I/O connector pin descriptions

pin assignments (figure), 3-2 Port C pin assignments, 3-4 signal connection descriptions (table), 3-3

IBF signal

description (table), 3-12 mode 1 input timing (figure), 3-13 mode 2 bidirectional timing (figure), 3-15

installation. See also configuration.

common questions, C-1 to C-2 hardware, 2-1to2-4 software, 2-1 unpacking DAQPad-6507/6508

devices, 1-6

interrupt control circuitry, 4-2 INTR signal

description (table), 3-12 mode 1 input timing (figure), 3-13 mode 1 output timing (figure), 3-14 mode 2 bidirectional timing (figure), 3-15

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LabVIEW and LabWindows/CVI

software, 1-3

LED patterns for DAQPad-6507/6508 states

common questions, C-2 description (table), 2-3

low DIO state, 3-10 to 3-11

manual. See documentation. mode 1 input timing (figure), 3-13 mode 1 output timing (figure), 3-14 mode 2 bidirectional timing (figure), 3-15

NI-DAQ Configuration Utility, C-1 NI-DAQ driver software, 1-4 t o 1-5

overview, 1-4 relationship with programming

environment (figure), 1-5

version required for DAQPad-6507/6508

devices (note), 2-1

OBF* signal

description (table), 3-12 mode 1 output timing (figure), 3-14

mode 2 bidirectional timing (figure), 3-15 OKI 82C55A data sheet, B-1 to B-17 operation of DA QPad-6507/6508 de vices. See

theory of operation.

physical specifications, A-2 pin assignments

cable assembly connectors

pins 1 through 50 (figure), 3-5

pins 51 through 100 (figure), 3-6 I/O connector pin description (figure), 3-2 Port C pin assignments, 3-4

Plug and Play configuration, 2-4 polarity selection, resistors used (note), 2-3 Port A (PPI A), 3-7 Port B (PPI C), 3-7 Port C pin assignments (figure), 3-4 power, connecting to digital I/O lines, 3-8 power considerations, 2-4 to 2-5

connections between computer or USB

hub and DAQPad device (figure), 2-2

damage due to incorrect connections

(caution), 3-8 methods for turning off DAQPad, 2-5 power connections, 3-8 power requirement specifications, A-2 self-resetting fuse, 3-8 suspend mode, 2-4 to 2-5

PPI A (Port A), 3-7 PPI C (Port B), 3-7

questions and answers, C-1 to C-2

digital I/O, C-2 general information, C-1 installation and configuration, C-1 to C-2

RD* signal

description (table), 3-12 mode 1 input timing (figure), 3-13 mode 2 bidirectional timing (figure), 3-15

requirements for getting started, 1-2

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screw terminal assignments (figure), 3-1 Set_DAQ_Device_Info function (note), 2-5 signal connections, 3-1 to 3-15

cable assembly connectors, 3-4 to 3-6

overview, 3-4 pin assignments

pins 1 through 50 (figure), 3-5

pins 51 through 100 (figure), 3-6 digital I/O signal connections, 3-7 digital I/O state selection, 3-9 to 3-11

floating DIO state, 3-11 high DIO state, 3-9 to 3-10

low DIO state, 3-10to 3-11 exceeding maximum ratings (note), 3-1 I/O connector pin description

pin assignments (figure), 3-2

Port C pin assignments, 3-4

signal connection descriptions

(table), 3-3 power connections, 3-8 screw terminal assignments (figure), 3-1 timing specifications, 3-11 to 3-15

mode 1 input timing (figure), 3-13 mode 1 output timing (figure), 3-14 mode 2 bidirectional timing

(figure), 3-15

signal descriptions (table), 3-1 2 software installation, 2-1 software programming choices, 1-2 to 1-5

National Instruments application

software, 1-3

NI-DAQ driver software, 1-4 t o 1-5

specifications, A-1 to A-2

digital I/O, A-1 to A-2 environment, A-2 physical, A-2 power requirements, A-2

SSR-OAC-5 and SSR-O AC-5A output

modules, driving (note), 1-2

STB* signal

description (table), 3-12 mode 1 input timing (figure), 3-13 mode 2 bidirectional timing (figure), 3-15

suspend mode, 2-4 to 2-5

technical support, D-1 to D-2 telephone and fax support numbers, D-2 theory of operation, 4-1 to 4-3

82C55A Programmable Peripheral

Interface, 4-2

block diagram of DAQPad-6507/6508

devices, 4-1 digital I/O connector, 4-3 interrupt control circuitry, 4-2 USB microcontroller, 4-2

timing specifications, 3-11 to 3-15

mode 1 input timing (figure), 3-13 mode 1 output timing (figure), 3-14 mode 2 bidirectional timing (figure), 3-15 signal descriptions (table), 3-12

troubleshooting. See questions and answers. turning off DAQPad-6507/6508 devices, 2-5

unpacking DAQPad-6507/6508 devices, 1-6 USB cable

power connections between DAQPad

device and USB hub (figure), 2-2 power supply to DAQPad-6507/6508

devices, 2-4

USB microcontroller

common questions, C-1 description, 4-2

VirtualBench software, 1-3

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WR* signal

description (table), 3-12 mode 1 output timing (figure), 3-14 mode 2 bidirectional timing (figure), 3-15

Index

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

National Instruments DAQPad-6508, DAQPad-6507 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

DAQPad-6507/6508 User Manual

Organization of This Manual

Conventions Used in This Manual

National Instruments Documentation

Related Documentation

Customer Communication

About the DAQPad-6507 and DAQPad-6508 Devices

What You Need to Get Started

Software Programming Choices

National Instruments Application Software

Optional Equipment

Custom Cabling

Unpacking

Software Installation

Hardware Installation

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

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

Configuration

Power Considerations

I/O Connector Pin Description

I/O Connector Signal Connection Descriptions

Port C Pin Assignments

Cable Assembly Connectors

Digital I/O Signal Connections

Power Connections

Connecting Power Sources to Digital I/O Lines

Digital I/O State Selection

High DIO State

Low DIO State

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

Floating DIO State

Timing Specifications

Mode 1 Input Timing

Mode 1 Output Timing

Mode 2 Bidirectional Timing

Interrupt Control Circuitry

USB Microcontroller

82C55A Programmable Peripheral Interface

Digital I/O Connector

Glossary

Index