http://www.tetraedre.com/advanced/serial2.php?new_lang=en re Development of VHDL & Verilog modules
which says, among many other things:
COM10 and above
On Microsoft Windows, you can use COM1 to COM9 to access serial ports but to access ports with numbers above 9, you need to use the following port name : \\.\COM10.
Note that it is also possible to used \\.\COM1 to access COM1.
Don't know if this is relevant to your problem but here's hoping it some help.
In reply to Re: Win32::SerialPort can't find device
by ww
in thread Win32::SerialPort can't find device
by tikihiki
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