They supply a driver that creates the virtual comport. Their website has a lot of stuff on general USB com ports. We needed to connect to external devices with USB interface chips made by a company called FTDI. This will show up in device manager as a serial coms port, you can then Read and write to it using a Com port component like TCommportdriver (there are several of these) The method I have used success fully (so far) involves installation of a Virtual Com port. Two ways that I know of :- First thing though is that USB is not really an external serial port as such so you cannot just hook up to it you need some sort of Driver.
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