Agilent Technologies E2094S Podręcznik Użytkownika Pobierz pdf (Strona 98)

98 Agilent VISA User’s Guide

4 Programming via GPIB and VXI

/* Read device type register contents */

/* ViAddr is defined as a void so we must cast

/* it to something else to do pointer

arithmetic */

viPeek16(dmm, (ViAddr)((ViUInt16 *)address +

0x01),

&devtype_reg);

/* Unmap memory space */

viUnmapAddress(dmm);

/* Print results */

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

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

devtype_reg);

/* Close sessions */

viClose(dmm);

viClose(defaultRM);

}

Sample: Using the GPIB-VXI Interface (Low-Level) Memory

Functions

This program uses low-level memory functions and the GPIB-VXI

interface to read the ID and Device Type registers of a device at

GPIB-VXI0::24.

/*gpibvxil.c

This example program uses the low-level memory

functions to read the id and device type

registers of the device at GPIB-VXI0::24. Change

this address if necessary. Register contents are

then displayed.*/

#include <visa.h>

#include <stdlib.h>

#include <stdio.h>

void main () {

ViSession defaultRM, dmm;

ViAddr address;

unsigned short id_reg, devtype_reg;

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Agilent Technologies E2094S Podręcznik Użytkownika Strona 98