Agilent Technologies FS2010 Guía de usuario descargar pdf (Pagina 112)

112 Agilent VISA User’s Guide

4 Programming via GPIB and VXI

/* 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);

/* 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

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Agilent Technologies FS2010 Guía de usuario Pagina 112