Agilent Technologies E2094S Uživatelská příručka stáhnout pdf (Strana 43)

Programming with VISA 3

Agilent VISA User’s Guide 43

Example: Sending and Receiving Formatted I/O The following

C sample program demonstrates sending and receiving formatted I/O.

The program opens a session with a GPIB device and sends a comma

operator to send a comma-separated list. This program shows specific

VISA functionality and does not include error trapping.

This example program is installed on your system in the

ProgrammingSamples subdirectory.

/*formatio.c

This example program makes a dmm measurement

with a comma-separated list passed with

formatted I/O and prints the results. You may

need to change the device address. */

#include <visa.h>

#include <stdio.h>

void main () {

ViSession defaultRM, vi;

double res;

double list [2] = {1,0.001};

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

viOpenDefaultRM(&efaultRM);

viOpen(defaultRM, "GPIB0::22::INSTR",

VI_NULL,VI_NULL, &vi);

/* Initialize device */

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

/* Set-up device,send comma-separated list */

viPrintf(vi, "CALC:DBM:REF 50\n");

viPrintf(vi, "MEAS:VOLT:AC? %,2f\n", list);

/* Read results */

viScanf(vi, "%lf", &res);

/* Print results */

printf("Measurement Results: %lf\n", res);

/* Close session */

viClose(vi);

viClose(defaultRM);

}

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Agilent Technologies E2094S Uživatelská příručka Strana 43