Sure - I should have been more precise in my language. For our application, the voltages need to update within a few tens of milliseconds of each other. If they do not update truly simultaneously that is fine, because the fluidic circuit they are going into will not respond any faster than that. So, the serial nature of the communications is not a problem, but the delay of several seconds between sending a command on the LabView front panel and getting the voltages to actually update was long enough to be a problem. I've checked and now that the VISA opening VIs are outside the while loop, all four voltages are updating quickly enough for us. Thanks again!
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