Agilent Technologies FS2010 Podręcznik Użytkownika Pobierz pdf (Strona 105)

Programming via GPIB and VXI 4

Agilent VISA User’s Guide 105

High-Level Memory Functions: Sample Programs

Two sample programs follow that use the high- level memory

functions to read the ID and Device Type registers of a

device at the VXI logical address 24. The contents of the

registers are then printed out.

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);

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Agilent Technologies FS2010 Podręcznik Użytkownika Strona 105