Using a Zero Up device

Hi
IM using a number of Zero up power suppliers throw a Zero up controller connected by GPIB.
since I have to read different channels of the controller IM using the attached VI and initializing the communication each time.
the problem is that every now and then the initialize VI gives me the following error:
<ERR> nlZUP Initialize
The ID Query failed. This may mean that you selected the wrong instrument or your instrument did not respond. You may also be using a model that is not officially supported by this driver. If you are sure that you have selected the correct instrument and it is responding, try disabling the ID Query.
what should i do??
thanks
Shai
Attachments:
ZUP read.vi ‏21 KB
nlZUP.llb ‏561 KB

There is no reason to initialize/close every time. That's just a waste of time. The VISA session will remain available until you explicitly close it or you close out of LabVIEW. How are you running this VI? Are you using the "Run Continuously" button? If so, stop. That button should not be used that way.
The error is being generated with the "nlZUP chechInstrumentType" VI. That VI is fed a string from the "nlZUP setPSAddress" VI, and is fed the result of the ":MDL?; " command. My guess is that sometimes you're not getting the right string returned. This could be a communication error, or perhaps the instrument is busy, and the wait time for the response is too short. As I said, unless you're physically changing the instrument on the fly while the VI is running, there is no point in always asking what kind it is.

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