I'm performing a VISA Write operation, and have received error -1073807339 that says, "Timeout expired before operation completed. At the start of my program I have a sub vi that initializes a Comm port session and then I don't close it until I stop the program. While the program runs I have a sub vi that writes to this port using the same session from the initialization but it doesn't work. I've tried using the Visa timeout VI before the write but that only sets a delay for the error to occur. If I close the session after the initialization then it works but I don't want to do a Visa Close until I stop Labview. Any ideas as to why it doesn't work with one open session at the beginning of my program.

LabVIEW

Error - 1073807339 during a Visa write

Author

This issue is from a long time ago so I don’t remember exactly what solved the problem. A lot of times it’s a matter of making sure all your VISA sessions are closed properly before performing a VISA read or write.

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LabVIEW

Error - 1073807339 during a Visa write

Re: Error - 1073807339 during a Visa write