I created an application using LabView 7.1 that has run on Windows XP. I tried to install this app on a Windows 7 based PC and the serial port communication no longer works. I have installed the latest version of NI-VISA but still does not work. Reading through the other discussions, upgrading to a new version of LabVIEW is necessary but is there another solution?
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When you say the serial port drivers, are you referring to the old serial port drivers that used port I/O functions? If so, they won't work. You will need to update the code so you use VISA.
And, yes, LabVIEW 7 is not supported on Windows 7.
There is no workaround. The latest version of VISA does not support LabVIEW 7. The earliest version of NI-VISA that supports Windows 7 is 4.6, and that does not support LabVIEW 7. You need to either upgrade LabVIEW or use an older OS.