Great! I'm glad we've been of some assistance. Are you trying to communicate with multiple instruments inside of the same Instrument I/O Assistant Express VI? What I mean is, do you have multiple Select Instrument steps in the same Express VI? That is not really how the Assistant is intended to be used. I would drop another instance of the Assistant to deal with your other instrument.
You can tell which instrument is being addressed in the code of the Express VI if you right click on the blue Instrument I/O Assistant VI and select "Open Front Panel". Then you can view what resource strings are being passed into the various VISA functions. If this doesn't help you fix the problem, attach the VI so we can take a look at it and get a better idea of what you are doing in the VI. -Tommy
