Agilent Technologies FS2010 Guia do Utilizador descarregar pdf (Página 16)

16 Agilent VISA User’s Guide

2 Building a VISA Application in Windows

Sample C/C++ Program Source Code

The source file idn.c follows. An explanation of the various

function calls in the sample is provided directly after the

program listing. If the program runs correctly and your PC

is connected to a 54622A oscilloscope, the following is an

example of the program output.

AGILENT TECHNOLOGIES,54622A,987654312,A.01.50

If the program does not run, see the Event Viewer for a list of

run- time errors.

/*idn.c

This example program queries a GPIB device for

an identification string and prints the

results. Note that you must change the address.

#include <visa.h>

#include <stdio.h>

void main () {

ViSession defaultRM, vi;

char buf [256] = {0};

/* Open session to GPIB device at address 22 */

viOpenDefaultRM(&defaultRM);

viOpen(defaultRM,

"GPIB0::22::INSTR",VI_NULL,VI_NULL,

&vi);

/* Initialize device */

viPrintf(vi, "*RST\n");

/* Send an *IDN? string to the device */

viPrintf(vi, "*IDN?\n");

/* Read results */

viScanf(vi, "%t", buf);

/* Print results */

printf("Instrument identification string:

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Agilent Technologies FS2010 Guia do Utilizador Página 16