Agilent Technologies E2094S Uživatelská příručka stáhnout pdf (Strana 66)

66 Agilent VISA User’s Guide

3 Programming with VISA

void main(){

ViSession defaultRM,vi;

ViEventType eventType;

ViEvent eventVi;

ViStatus err;

ViInt16 trigId;

/* open session to VXI device */

viOpenDefaultRM(&defaultRM);

viOpen(defaultRM, "VXI0::24::INSTR", VI_NULL,

VI_NULL, &vi);

/* select trigger line TTL0 */

viSetAttribute(vi, VI_ATTR_TRIG_ID,

VI_TRIG_TTL0);

/* enable the event */

viEnableEvent(vi, VI_EVENT_TRIG, VI_QUEUE,

VI_NULL);

/* fire trigger line, twice */

viAssertTrigger(vi, VI_TRIG_PROT_SYNC);

/* Wait for the event to occur */

err=viWaitOnEvent(vi, VI_EVENT_TRIG, 10000,

&eventType, &eventVi);

if(err==VI_ERROR_TMO){

printf("Timeout Occurred! Event not

received.\n");

return;

}

/* print the event information */

printf("Trigger Event Occurred!\n");

printf("...Original Device Session = %ld\n",

vi);

/* get trigger that fired */

viGetAttribute(eventVi, VI_ATTR_RECV_TRIG_ID,

&trigId);

printf("Trigger that fired: ");

switch(trigId){

case VI_TRIG_TTL0:

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Agilent Technologies E2094S Uživatelská příručka Strana 66