Agilent Technologies ESA-E Series Programmer's Manual page 121

Programming Examples
Determine if an Error has Occurred
/*Get the HP-IB address of the insrument, which has interrupted*/
viQueryf(viESA,"SYST:COMM:GPIB:SELF:ADDR?\n","%t", cBuf);
printf ("\n Instrument at HP-IB Address %s Has Generated an Interrupt!\n",cBuf);
/*Get the status byte*/
/* If the ESA generated the interrupt, determine the nature of the interrupt
either a measurement is uncalibrated or an error message has occurred?*/
viQueryf(viESA, "STAT:QUES:INT:EVEN?\n", "%d", &iStatusByte);
if ( (0x08 & iStatusByte))
printf("\n SRQ message:\t Measurement uncalibrated\n");
/* If the ESA generated the interrupt, determine the nature of the interrupt;
did is the measurement complete or an error message occur?*/
viQueryf(viESA, "*ESR?\n", "%d", &iStatusByte);
if ( (iStatusByte !=0) && (0x01 & iStatusByte))
printf("\n SRQ message:\t Measurement complete\n");
else if ( (iStatusByte !=0) && (0x02 | 0x10 | 0x20 & iStatusByte ))
printf ("\n SRQ message:\t Error Message Occurred\n");
/*Return successfully*/
iSrqOccurred =1;
return VI_SUCCESS;
}
void main()
{
/*Program Variables*/
ViStatus viStatus
long lOpc= 0L;
int iIntNum= 0;
long lCount= 0L;
/* Open a HP-IB session at address 18*/
viStatus=viOpenDefaultRM(&defaultRM);
viStatus=viOpen(defaultRM,"GPIB0::18",VI_NULL,VI_NULL,&viESA);
if(viStatus)
{
printf("Could not open a session to HP-IB device at address 18!\n");
exit(0);
}
/*Clear the instrument*/
viClear(viESA);
/*Reset the instrument*/
viPrintf(viESA,"*RST\n");
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= 0;
Chapter 3