My guess is that Win32::SerialPort isn't using the CreateFile API, or is using it in a way that doesn't allow to specify COM ports beyond 9. I guess you have two possible approaches - the first is the way of lesser resistance by moving the USB device to a COM port below 10, the other is to investigate how to convince Win32::SerialPort to use "\\\\.\\COM10", which seems to be the extended syntax to access COM ports beyond 9.

In reply to Re: Perl->Win32::CommPort->COM ports->Kernel32->ftdi driver by Corion
in thread Perl->Win32::CommPort->COM ports->Kernel32->ftdi driver by gluphus

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