I have a Labwindows/CVI 2016 application that communicates with a bunch of Eurotherm temperature controllers via RS-232 using a NI USB-232. I have been running it for several months under Windows 7 and it goes through and queries all the Eurotherms in 1.6 seconds, consistently. When I switch over to a Windows 10 computer this query time is very erratic, sometimes it might take 1.6 sec. but most times is in the 4 to 5 second range. I have the same version of the drivers on both computers (NI-Serial 15.0) and I'm using the native calls: OpenComConfig, ComRd, etc.
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