Agilent Technologies FS2010 User's Guide download pdf (Page 113)

Programming via GPIB and VXI 4

Agilent VISA User’s Guide 113

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;

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

viOpenDefaultRM(&defaultRM);

viOpen(defaultRM, "GPIB-VXI0::24::INSTR",

VI_NULL,

VI_NULL,&dmm);

/* Map into memory space */

viMapAddress(dmm, VI_A16_SPACE, 0x00, 0x10,

VI_FALSE,

VI_NULL, &address);

/* Read instrument id register contents */

viPeek16(dmm, address, &id_reg);

/* 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);

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Agilent Technologies FS2010 User's Guide Page 113