Hi, I have a compiled program in LV2016 which utilises a serial connection via Com1 to a flow meter. Occasionally at startup it can't find/access the COM1 port. When I run NI-Max 18.5 to check/configure the port it says it exists but it can't access it. If I unistall COM1 via the Device manager and restart the PC it returns and all is good. So is it me, Windows 10 or Labview that is having the issue?? I'm running Win10 build 1809, LV2016 f6 runtime, NI-Visa 18.5, NI Serial engine 2018, NI-DAQmx 18.5. thanks Greg

LabVIEW

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Updated the BIOS and several drivers on the DELL PC.

I have been running for a week with no loss of connection to the COM port. So all good.

thanks

Greg

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