LabVIEW Basics 1 for 6.1.pdf

LabVIEW TM Basics I

Introduction

Course Manual

Course Software Version 6.1

December 2001 Edition

Part Number 320628J-01

LabVIEW Introduction Course Manual

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consent of National Instruments Corporation.

Trademarks

LabVIEW™, National Instruments™, and ni.com™ are trademarks of National Instruments Corporation.

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

Patents

For patents covering National Instruments products, refer to the Help»About dialog box in your software (if applicable),

the patents.txt file on your CD (if applicable), and/or ni.com/legal/patents .

Worldwide Technical Support and Product Information

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Contents

Student Guide

A. About This Manual ...............................................................................................vii

B. What You Need to Get Started .............................................................................ix

C. Installing the Course Software..............................................................................x

D. Course Goals and Non-Goals ...............................................................................xi

E. Course Conventions ..............................................................................................xii

Lesson 1

Introduction to LabVIEW

A. LabVIEW..............................................................................................................1-2

B. Virtual Instruments ...............................................................................................1-3

C. LabVIEW Environment ........................................................................................1-6

D. LabVIEW Help and Manuals ...............................................................................1-18

Lesson 2

Creating, Editing, and Debugging a VI

A. Creating a VI.........................................................................................................2-2

B. Editing Techniques ...............................................................................................2-11

C. Debugging Techniques .........................................................................................2-20

Lesson 3

Creating a SubVI

A. SubVIs ..................................................................................................................3-2

B. Icon and Connector Pane ......................................................................................3-3

C. Using SubVIs ........................................................................................................3-10

D. Creating a SubVI from Sections of a VI...............................................................3-17

Lesson 4

Loops and Charts

A. While Loops..........................................................................................................4-2

B. Waveform Charts ..................................................................................................4-4

C. Shift Registers.......................................................................................................4-17

D. For Loops ..............................................................................................................4-26

iii

LabVIEW Introduction Course Manual

Contents

Lesson 5

Arrays, Graphs, and Clusters

A. Arrays....................................................................................................................5-2

B. Auto-Indexing .......................................................................................................5-4

C. Array Functions ....................................................................................................5-6

D. Polymorphism .......................................................................................................5-8

E. Waveform and XY Graphs ...................................................................................5-11

F. Clusters .................................................................................................................5-25

G. Cluster Functions ..................................................................................................5-28

Lesson 6

Case and Sequence Structures

A. Case Structures .....................................................................................................6-2

B. Sequence Structures ..............................................................................................6-10

C. Formula and Expression Nodes ............................................................................6-14

D. Avoiding Overusing Sequence Structures ............................................................6-18

Lesson 7

Strings and File I/O

A. Strings ...................................................................................................................7-2

B. String Functions ....................................................................................................7-4

C. File I/O VIs and Functions....................................................................................7-9

D. Formatting Spreadsheet Strings ............................................................................7-17

E. High-Level File I/O VIs........................................................................................7-21

Lesson 8

Data Acquisition and Waveforms

A. Overview and Configuration ................................................................................8-2

B. Organization of Data Acquisition VIs ..................................................................8-11

C. Performing a Single Analog Input ........................................................................8-13

D. DAQ Wizards .......................................................................................................8-17

E. Waveform Analog Input .......................................................................................8-20

F. Writing Waveform Data to File ............................................................................8-22

G. Analog Output.......................................................................................................8-25

H. Counters ................................................................................................................8-28

Lesson 9

Instrument Control

A. Instrument Control Overview ...............................................................................9-2

B. GPIB Communication and Configuration ............................................................9-3

C. Communicating with Instruments.........................................................................9-9

D. Using Instrument Driver VIs ................................................................................9-12

E. VISA .....................................................................................................................9-18

LabVIEW Introduction Course Manual

ni.com

Contents

F. Using VISA VIs and Functions ............................................................................9-20

G. Serial Port Communication...................................................................................9-24

H. Waveform Transfers (Optional)............................................................................9-33

Appendix A

A. Additional Information .........................................................................................A-1

B. ASCII Character Code Equivalents Table ............................................................A-4

C. Instructor Notes.....................................................................................................A-7

LabVIEW Introduction Course Manual

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