Error query.vi in my D6000 single phase

Question

hello everyone , recently I am using the Labview 2009
I am running the program LEM D6000 single phase.vi
but in the Error Query.vi(inside D6000 Config Measurement block) there is always a mistake, Error 1300,, because after the VISA read , there comes in a number and compared to those constant number, first row and first column is 16, which somtimes is smaller than the number comes in , so it gives the comparison result as T, Error happens
so I changed 16 to 64, no more errors comes up
So I wonder what is the real function of Error Query is , and why shall I change the constant number to avoid the errors, although I make it work, but I want to know why.
Thank you very much
Attachments:
lem_instruments_d6000.zip ‏781 KB

Answer 1

The error conditions and the Event Status Register should be documented in the instrument manual. Not sure where to start with the basics. There are individual bits in the ESR and the instrument will set specific ones depending on the actual error that the instrument detects. Are you familiar with Boolean math? Bit number 4 reflects a specific error. If you want to check to see if the bit is set, you would AND it with decimal 16 or binary 10000. If bit 1 is set, the result of the AND is 1. You decided to AND it with 64 (a check of bit 5) and by doing that, you are no longer checking to see if bit 4 is set. That is ignoring the error. If you want to ignore any errors, don't run the error query program. Changing the code is just plain wrong.