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详细说明：NI-VISA Programmer Reference Manual NI-VISA 用户手册Important Information
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Table
Contents
Table of contents
About this manual
Organization of This manual
Conventions used in This manual
······
How to Use This documentation Set
Ⅺ1
Related documentation
Customer communication
Chapter 1
Introduction
How to Use This manual
1-1
What You Need to get Started
1-1
Background
1-2
Chapter 2
Introductory Programming Examples
Example of Message-Based Communication
Example2-1……
2-2
Example 2-1 Discussion
Example of Register-Based Communication
2-4
Example2-2………
Example 2-2 Discussion
2-6
Example of Handling Events
2-7
cuing…………
2-7
Example 2-3
…2-8
Example 2-3 Discussion
2-9
Example of locking.…
2-10
Example 2-4
2.10
Example 2-4 Discussion
.2-12
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N/-VSA User manual
Table of contents
Chapter 3
VISA Overview
Introduction
Objectives of VISA
Programming with VIsA
Beginning Terminology......
Communication channels
.3-5
The resource manager..
Register Communication
Example of Interface Independencc……
Chapter 4
Message-Based Communication
Introduction
4-1
Basic io se
4-2
Synchronous Read/Write Services
4-2
Asynchronous Read/Write Services .....44
Clear service
4-5
4-6
Status/Service Rcqucst Service
4-6
Formatted I/O Services
4-8
Formatted l/O Operations
.4-8
Variable List operations
4
Manually Flushing the Formatted l/O Buffers
10
Automatically flushing the formatted I/o Buffers
4-11
Resizing the Formatted I/o Buffers
中··
4-12
Controlling the Serial I/O Buffers
··········:·:··············::··
4-12
Example VISA Message-Based Application
Example4-l………
Chapter 5
Register-Based Communi cation
Introduction
High-Level Access Operations
5-2
High-Level block Operations
Low-Level Access Operations
Overview of register Accesses from Computers
Using Visa to Perform Low-Level Register Accesses
perations versus Pointer Dereference………………
Manipulating the pointer
5-8
Examp
5-8
Bus errors
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Table of contents
Comparison of High-Level Access versus Low-Level Access
5-9
Spee
5-9
Ease of use
-10
Accessing Multiple Address spaces.......
5-10
Shared Memory operations
5-11
Shared Memory Sample code
·····
5-11
Example 5-2..............
5-12
Chapter 6
VISA Resource Manager
Purpose of the vIsa Resource Manager.……
Using the visa resource manager.
6-2
Accessing Resource
Example 6-1
6-2
Searching for Resources
6-4
Example 6-2.........
6-4
Chapter 7
VISA Events
Introduction…
7-1
Supported Events. .........7-2
Enabling and Disabling Events
Queuing
74
Callbacks
Callback modes
7-6
Independent Qu
17-7
The user Handle parameter ......................7-8
Queuing and Callback Mechanism Sample Code ..................7-9
Example 7-1
7-9
he Life of the e
7-11
Event Context with the Queuing Mechanism ................7-11
Event Context with the callback mechanism
7-11
chapter 8
VISA Locks
Introduction
8-1
Lock Types
·;······…····
8-1
Lock Sharin
g
8-2
Acquiring an Exclusive Lock While owning a Shared Lock
8-3
Locking Sample code.…
8-4
Example 8-l
8-4
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N/-VSA User manual
Table of contents
Chapter 9
NI-VSA Platform-Specific and Portability Issues
Programming Considerations
Multiple applications Using the NI-VISA Driver
9-1
Low-Level Access functions
.9-2
Interrupt Callback Handlers
.9-2
Accessing VXiplug&play Files...........9-4
Multiple interface support issues
9-5
VXI and gPIb platforms
9-5
Multiple gpiB-vXI Support........
Serial Port support
VME Support..…,
Windows 3.x issues
…9)-7
Installation overview
9-7
Memory model
Application Stack Size.........................9-8
Appendix A
Visual Basic Examples
Appendix B
Customer Communi cation
Glossary
Index
Tables
Table1-1.NI- VISA Support......,,……,
Table 9-1. How Visa Invokes callbacks
9-3
Table 9-2. Hlow to Find Your VXlplugrplay directory
94
Table 9-3. How Serial Ports are numbered
9-6
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About
Manual
About this manual
This manual contains information on using the VISA Library
Application Programmers Interface(API. This manual is meant to be
Ised with the Ml-vIsA Programmer Reference Manual
Organization of This Manual
This manual is organized as follows
Chapter 1, Introduction, discusses how to use this manual, lists
what you need to get started, and contains a brief description of the
VISA Librar
Chapter 2, Introductory Programming Examples, introduces some
examples of common communication between instrument
Chapter 3, VISA Overview, contains an overview of the VIsa
Library.
Chapter 4, Message-Based Communication, shows how to use the
VISa library in message-based communication
Chapter 5, Register-Bused Communicalion, shows how to use the
VISA library in register-based communication
Chapter 6, VISA Resource Manager, describes the purpose of the
VISA Resource Manager in an instrumentation system and
discusses its two most important aspects: opening sessions to
resources, and searching for particular resources that are currentl
available through the resource Manager.
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N/-VSA User manual
Chapter 7, VISA Events, describes the VISa event model and how
to use it
Chapter 8. VISA Locks, describes Visa locks and how they are
intended to be used
Chapter 9, M-VISA Plalorm-Specilic and Porlabilily lssues
discusses programming information for you to consider when
developing applications that use the ni-visa driver
Appendix a, visual Basic examples, shows the Visual Basic
syntax of the aNSi C examples given earlier in this manual. The
examples use the same numbering sequcnce for casy reference
Appendix b, Customer Communication, contains forms you can
use to request help from National Instruments or to comment on
our products and manuals
The Glossary contains an alphabetical list and description of terms
used in this manual, including abbreviations, acronyms, metric
prefixes, mnemonics, and symbols
The index contains an alphabetical list of key terms and 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
bold
Bold text denotes parameters, menus, menu items, dialog box buttons
or options, or error messages.
bold italic
Bold italic text denotes a note, caution, or warning
bold
Bold text in this font denotes the messages and responses that the
monospace computer automatically prints to the screen. This font also emphasizes
lines of example code that are different from the other examples
Italic text denotes emphasis, a cross reference, or an introduction to a
key concept
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About This manual
ita1⊥c
Italic text in this font denotes that you must supply the appropriate
monospace words or values in the place of these items
monospace Text in this font denotes text or characters that are to be literally input
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 program code
Abbreviations, acronyms, metric prefixes, mnemonics, symbols, and
terms are listed in the glossary
How to Use this documentation set
Use the documentation that came with your gPib and/or vXi hardware
and software for Windows to install and configure your system
Refer to the read me first document for information on installing the
nI-Visa distribution media
Use the Ni-visa User manual for detailed information on how to
ogram usin
ng VISA
Use the Nl-VISA Programmer Reference Manual for specific
information about the attributes events and operations, such as format
syntax, parameters, and possible crrors
Related documentation
The following documents contain information that you may find
helpful as you read this manual
ANSI/IEEE Standard 488. 1-1987, IEEE Standard Digital Interface
for Programmahle /nstrumentation
ANSI/IEEE Standard 488.2-1992. IEEE Standard Codes, Formats
Protocols and Common commands
ANSI/IEEE Standard 1014-1987, IEEE Standard for a versatile
Backplane Bus. VMEbus
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