What is the best way to access a serial port from VBA?

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The Win32 API handles the serial port as a file. You can access the serial ports directly by calling these API functions from within VBA. I had to do this for an old .NET application but VBA is no different.

Rather than hash it out for you on this site, here’s a reference I’ve hung onto over the years. How to perform serial port communications in VBA

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