Agilent Technologies E2094S Guía de usuario descargar pdf (Pagina 97)

Programming via GPIB and VXI 4

Agilent VISA User’s Guide 97

Low-Level Memory Functions: Code Samples

Two sample programs follow that use the low-level memory functions

to read the ID and Device Type registers of the device at VXI logical

address 24. The contents of the registers are then printed out. The first

program uses the VXI interface and the second program uses the

GPIB-VXI interface to access the VXI backplane. These two programs

are identical except for the string passed to viOpen.

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

Functions

This program uses low-level memory functions and the VXI interface to

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

/*vxill.c

This example program uses the low-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;

ViAddr address;

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);

/* 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);

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Agilent Technologies E2094S Guía de usuario Pagina 97