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160 Chapter 3
Programming Examples
Determine if an Error has Occurred
viPrintf(viESA,"INIT:CONT 1 \n");
/*Manually couple sweeptime to 5ms. reduce resolution BW to 30 KHz.
"Meas Uncal" should be displayed on the screen, and an interrupt should
be generated.*/
viPrintf(viESA,"SENS:SWE:TIME 5 ms \n");
viPrintf(viESA,"SENS:BAND:RES 30 KHZ \n");
/*Wait for SRQ*/
WaitForSRQ();
/*Pause for 5 seconds to observe "Meas Uncal" message on ESA display*/
Sleep(5000);
/* Set the service request mask to assert SRQ when either a measurement
is completed or an error message has occurred.*/
viPrintf(viESA,"*SRE 96\n");
viPrintf(viESA,"*ESE 35\n");
/*Send an undefined command to the device*/
viPrintf(viESA,"IDN\n");
/*Wait for SRQ*/
WaitForSRQ();
/*Disable and uninstall the interrupt handler*/
viDisableEvent (viESA, VI_EVENT_SERVICE_REQ,VI_HNDLR);
viUninstallHandler(viESA, VI_EVENT_SERVICE_REQ, sSrqHdlr,ViAddr(10));
/*Clear the instrument status register*/
viPrintf(viESA,"*SRE 0 \n");
viPrintf(viESA,"*ESE 0 \n");
viPrintf(viESA,"STAT:QUES:ENAB 0\n");
viPrintf(viESA,"STAT:QUES:INT:ENAB 0\n");
/*Clear the status byte of the instrument*/
viPrintf(viESA,"*CLS\n");
/*Close the session*/
viClose(viESA);
viClose(defaultRM);
}