Programming Examples

C Programming Examples using VTL

C Programming Examples using VTL

The programming examples that are provided in this guide are written using the C programming language and the VTL (VISA transition library). This section includes some basic information about programming in the C language. Refer to your C programming language documentation for more details. (This information is taken from the manual “HP VISA Transition Library”, HP part number

E2090-90026.) If you are using the National Instruments VISA library, most of this information will still apply, but the include and library files will be in different subdirectories. Also, this information assumes a computer running a Windows 95 operating system with an HP/Agilent 82341C GPIB interface card is being used. The following topics are included:

“Typical Example Program Contents” on page 96. “Linking to VTL Libraries” on page 97.

“Compiling and Linking a VTL Program” on page 97. “Example Program” on page 99.

“Including the VISA Declarations File” on page 99. “Opening a Session” on page 100.

“Device Sessions” on page 100.

“Addressing a Session” on page 102. “Closing a Session” on page 103.

Typical Example Program Contents

The following is a summary of the VTL function calls used in the example programs.

visa.h

This file is included at the beginning of the file to provide the

 

function prototypes and constants defined by VTL.

ViSession

The ViSession is a VTL data type. Each object that will

 

establish a communication channel must be defined as

 

ViSession.

viOpenDefaultRM

You must first open a session with the default resource manager with the viOpenDefaultRM function. This function will initialize the default resource manager and return a pointer to that resource manager session.

viOpen

This function establishes a communication channel with the

 

device specified. A session identifier that can be used with other

 

VTL functions is returned. This call must be made for each

 

device you will be using.

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Chapter 3

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Agilent Technologies Model A.08.xx manual Programming Examples using VTL, Typical Example Program Contents
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