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National Instruments Low-Cost Multifunction I/O Board for ISA Lab-PC+ Signal Connection Descriptions

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Signal Connections Chapter 3

Lab-PC+ User Manual 3-2 © National Instruments Corporation

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PC3

PC2PC1

PC0PB7

PB6PB5

PB4PB3

PB2PB1

PB0PA7

PA6PA5

PA4PA3

PA2PA1

PA0DGND

DAC1 OUTAGND

ACH6

ACH4

ACH2

ACH5

AISENSE/AIGND

ACH7

PC4

PC5 PC6

PC7 EXTTRIG

OUTB0

EXTCONV*

+5 V

CLKB2GATB2

OUTB2

CCLKB1

GATB1COUTB1

GATB0

DGND

DAC0 OUT

ACH1

ACH3

ACH0

EXTUPDATE*

Figure 3-1. Lab-PC+ I/O Connector Pin Assignments

Signal Connection Descriptions

The following list describes the connector pins on the Lab-PC+ I/O connector by pin number and

gives the signal name and the significance of each signal connector pin.

Contents

Main Page Warranty Copyright Trademarks Page Contents About This Manual Chapter 1 Introduction Chapter 2 Configuration and Installation Chapter 3 Signal Connections Chapter 4 Theory of Operation Page Figures Tables About This Manual Organization of the Lab-PC+ User Manual Conventions Used in This Manual National Instruments Documentation Customer Communication Chapter 1 Introduction About the Lab-PC+ What You Need to Get Started Software Programming Choices LabVIEW and LabWindows/CVI Application Software NI-DAQ Driver Software Register-Level Programming Optional Equipment Unpacking Chapter 2 Configuration and Installation Board Configuration PC Bus Interface Configuration and Installation Chapter 2 Figure 2-1. Parts Locator Diagram Lab-PC+ User Manual 2-2 National Instruments Corporation Base I/O Address Selection Page Page Page Page Analog I/O Configuration Analog Output Configuration Analog Input Configuration Page Page Analog Input Polarity Configuration Page Hardware Installation Chapter 3 Signal Connections I/O Connector Pin Description Signal Connections Chapter 3 Lab-PC+ User Manual 3-2 National Instruments Corporation Figure 3-1. Lab-PC+ I/O Connector Pin Assignments Signal Connection Descriptions Page Analog Input Signal Connections Types of Signal Sources Floating Signal Sources Ground-Referenced Signal Sources Input Configurations Differential Connection Considerations (DIFF Configuration) Differential Connections for Grounded Signal Sources Differential Connections for Floating Signal Sources Page Single-Ended Connection Considerations Single-Ended Connections for Floating Signal Sources (RSE Configuration) Single-Ended Connections for Grounded Signal Sources (NRSE Configuration) Common-Mode Signal Rejection Considerations Analog Output Signal Connections Digital I/O Signal Connections Page Page Page Page Page Page Page Timing Connections Page Page Page Page Page Page Cabling Chapter 4 Theory of Operation Figure 4-1. Lab-PC+ Block Diagram Functional Overview The block diagram in Figure 4-1 shows a functional overview of the Lab-PC+ board. PC I/O Channel Interface Circuitry Page Theory of Operation Chapter 4 Lab-PC+ User Manual 4-4 National Instruments Corporation Analog Input and Data Acquisition Circuitry Figure 4-3. Analog Input and Data Acquisition Circuitry Block Diagram Analog Input Circuitry Data Acquisition Timing Circuitry Page Page Page Analog Output Circuitry Digital I/O Circuitry Timing I/O Circuitry Theory of Operation Chapter 4 Figure 4-6. Timing I/O Circuitry Block Diagram PC I/O Channel Lab-PC+ User Manual 4-12 National Instruments Corporation I/O Connector Page Page Chapter 5 Calibration Calibration Equipment Requirements Calibration Trimpots Analog Input Calibration Board Configuration Bipolar Input Calibration Procedure Unipolar Input Calibration Procedure Analog Output Calibration Board Configuration Bipolar Output Calibration Procedure Page Unipolar Output Calibration Procedure Appendix A Specifications Analog Input Page Explanation of Analog Input Specifications Analog Output Explanation of Analog Output Specifications Digital I/O Timing I/O Triggers Bus Interface Power Requirements (from PC) Physical Environment Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Register Sizes Register Description Register Description Format Configuration and Status Register Group Page Page Page Page Page Page Page Page Page Page Analog Input Register Group Page Page Page Page Page Page Page 8253 Counter/Timer Register Groups A and B Page Page Page Page Page Page Page Page Page Page Page Page Page Page Interval Counter Register Group Page Page Appendix E Register-Level Programming Register Programming Considerations Initializing the Lab-PC+ Board Programming the Analog Input Circuitry Analog Input Circuitry Programming Sequence A/D FIFO Output Binary Modes Clearing the Analog Input Circuitry Programming Multiple A/D Conversions on a Single Input Channel Programming in Controlled Acquisition Mode Page Programming in Freerun Acquisition Mode Page Page External Timing Considerations for Multiple A/D Conversions Using the EXTCONV* Signal to Initiate A/D Conversions Programming Multiple A/D Conversions Using External Timing Programming in Controlled Acquisition Mode Page Page Page Programming in Freerun Acquisition Mode Programming Multiple A/D Conversions with Channel Scanning Programming Multiple A/D Conversions with Interval Scanning Programming Multiple A/D Conversions in Single-Channel Interval Acquisition Mode A/D Interrupt Programming Programming DMA Operation Programming the Analog Output Circuitry Page Interrupt Programming for the Analog Output Circuitry Programming the Digital I/O Circuitry Register Descriptions and Programming Examples Figure E-1. Control-Word Format with Control-Word Flag Set to 1 Modes of Operation for the 8255A Mode 0 Page Mode 1 Page Page Page Mode 2 Page Page Interrupt Programming for the Digital I/O Circuitry Appendix F Customer Communication Technical Support Form Lab-PC+ Hardware and Software Configuration Form National Instruments Products Other Products Documentation Comment Form Glossary Page Index Numbers A Page B C Page D E F G H I J L M N O P R S T U W