In that case, why dont you try simple vi to test your GPIB communicaton with your instrument. or you can even use the NIMAX to check your commnuication system.
If you can commnuicate fine with your instrument with simple vi or using NIMAX, then I suggest you post your VI here so that we can take a look and I am sure ppl here might be able to solve it out.
regards
nayisoe
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