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Reading Status Operation Register on the N9020A

Question asked by mocajoe on May 1, 2009
Latest reply on May 4, 2009 by Tardz

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Looking for the proper way to Query the Status Operation Register on my MXA . I want to poll the MXA after incrementing or decrementing my Video Trigger line to Find out when it triggeres on a signal in Zero Span Mode?
I know it is Bit 5 but I am not sure i am setting and reading it correctly

Thanks

Joe

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Tardz May 4, 2009 3:09 PM
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Hi, I'm not an expert in GPIB programmation but I do that with success in vb6. I call this function to check if status register bit 5 =1 that indicate a trigged sweep. If the value returned to main program is 0 you must change trig level and retry. The timeout was an arbitrary value, you may choose another value of timeout (here was 1 sec).

......
viVPrintf(N9020A,"*CLS" & VbLf,0)
viVPrintf(N9020A,"*ESE 5" & VbLf,0)         ' set status register #5, return a logic level 1 if there are a triggeg sweep.
viVPrintf(N9020A,":INIT IMM" & VbLf,0)
viVPrintf(N9020A,":*OPC" & VbLf,0)

space(buffer$)=3

startCHRONO=timer
DO
   viVPrintf(N9020A,":*ESR?" & VbLf,0)
   status=viSCanf(N9020A,"%t",buffer$)       ' TRIG is the value of status register bit 5
   TRIG=val(buffer$)
   if timer >startCHRONO +1 then EXIT DO                  ' 1 for 1 sec timeout. If there are no TRIG value =1, exit loop and change trig level (main program) and retry.
LOOP UNTIL TRIG=1

EXIT FUNCTION
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Reading Status Operation Register on the N9020A

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