Agilent Technologies E2094S Guide de l'utilisateur télécharger pdf (Page 62)

62 Agilent VISA User’s Guide

3 Programming with VISA

/* Send a bogus command to the message-based

device to cause an SRQ. Note: 'IDN' causes the

error -- 'IDN?' is the correct syntax */

viPrintf( vi, "IDN\n" );

/* Wait a while for the SRQ to be generated and

for the handler to be called. Print something

while we wait */

printf("Waiting for an SRQ to be generated.");

for (count = 0 ; (count < 10) &&

(srqOccurred == 0);count++) {

long count2 = 0;

printf( "." );

while ( (count2++ < 100) && (srqOccurred ==0)

){YIELD;

}

printf( "\n" );

/* disable and uninstall the handler */

viDisableEvent(vi, VI_EVENT_SERVICE_REQ,

VI_HNDLR);

viUninstallHandler(vi, VI_EVENT_SERVICE_REQ,

mySrqHdlr, (ViAddr)10);

/* Clean up - do not leave device in error

state */

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

/* close the sessions */

viClose(vi);

viClose(defaultRM);

printf( "End of program\n" );}

Using the Queuing Method

The queuing method is generally used when an immediate response

from your application is not needed. To use the queuing method for

receiving notification that an event has occurred, you must do the

following:

• Enable one or several events with the viEnableEvent function.

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Agilent Technologies E2094S Guide de l'utilisateur Page 62