Although I probably can't help with debugging your situation, one suggestion that I have is to maybe look at the source code of Control::CLI. On Windows, it uses Win32::SerialPort for serial port connections. Since this module is basically using Win32::SerialPort like what you're trying to do, it might be helpful to look at its source code for ideas on to do this in your code.

In reply to Re: Using Win32::SerialPort in a module by dasgar
in thread Using Win32::SerialPort in a module by jmClifford

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