Agilent Technologies E2094S Guide de l'utilisateur télécharger pdf (Page 91)

Programming via GPIB and VXI 4

Agilent VISA User’s Guide 91

The first program uses the VXI interface; the second program accesses

the backplane with the GPIB-VXI interface. These two programs are

identical except for the string passed to viOpen.

Sample: Using VXI Interface (High-Level) Memory

Functions

This program uses high-level memory functions and the VXI interface

to read the ID and Device Type registers of a device at VXI0::24.

/* vxihl.c

This example program uses the high-level memory

functions to read the id and device type

registers of the device at VXI0::24. Change this

address if necessary. The register contents are

then displayed.*/

#include <visa.h>

#include <stdlib.h>

#include <stdio.h>

void main () {

ViSession defaultRM, dmm;

unsigned short id_reg, devtype_reg;

/* Open session to VXI device at address 24 */

viOpenDefaultRM(&defaultRM);

viOpen(defaultRM, "VXI0::24::INSTR", VI_NULL,

VI_NULL, &dmm);

/* Read instrument id register contents */

viIn16(dmm, VI_A16_SPACE, 0x00, &id_reg);

/* Read device type register contents */

viIn16(dmm, VI_A16_SPACE, 0x02,

&devtype_reg);

/* Print results */

printf ("ID Register = 0x%4X\n", id_reg);

printf ("Device Type Register = 0x%4X\n",

devtype_reg);

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Agilent Technologies E2094S Guide de l'utilisateur Page 91