Agilent Technologies FS2010 Guia do Utilizador descarregar pdf (Página 90)

90 Agilent VISA User’s Guide

3 Programming with VISA

/* Open session to GPIB device at address 22 */

viOpenDefaultRM (&defaultRM);

viOpen (defaultRM, "GPIB0::22::INSTR",

VI_NULL,VI_NULL, &vi);

/* Initialize device */

viPrintf (vi, "*RST\n");

/* Make sure no other process or thread does

anything to this resource between viPrintf and

viScanf calls */

viLock (vi, VI_EXCLUSIVE_LOCK, 2000, VI_NULL,

VI_NULL);

/* Send an *IDN? string to the device */

viPrintf (vi, "*IDN?\n");

/* Read results */

viScanf (vi, "%t", &buf);

/* Unlock this session so other processes and

threads can use it */

viUnlock (vi);

/* Print results */

printf ("Instrument identification string:

%s\n", buf);

/* Close session */

viClose (vi);

viClose (defaultRM);}

Sample: Shared Lock

This sample shows a session gaining a shared lock with the

accessKey called lockkey. Other sessions can now use this

accessKey in the requestedKey parameter of the viLock

function to share access on the locked resource. This sample

then shows the original session acquiring an exclusive lock

while maintaining its shared lock.

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Agilent Technologies FS2010 Guia do Utilizador Página 90