Vesna,
Thanks -- that was what I was looking for. I had one trivial problem at first: the Init VI was broken, but I fixed that by reassigning a parameter from a VISA Set Timeout node (which I subsequently deleted) to the timeout input on an Old VISA Open VI. Apparently, VISA 3.1 isn't backward compatible with the VISA calls in your inst driver. I wonder if this explains why your driver wasn't available at ni.com/idnet?