Good point. So I put the test right after the new Win32::SerialPort($PortName), and that's where it failed, with the same error message.

In reply to Re^2: Win32::SerialPort Error: Overlapped-I/O operation is in progress ($^E too late) by Dr. Mu
in thread Win32::SerialPort Error: Overlapped-I/O operation is in progress by Dr. Mu

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