I've added some more info to the readme as I know it is lacking in detailed instructions. The simplest approach is to install it on an old Windows laptop which is already equipped with a serial port or a Windows computer with serial port before you wade into the intricacies of the Raspberry Pi. For a windows computer, it is fairly simple. Download & install asp.net runtime (link in Readme) & unzip the latest DiscChanger.NET release zip file. From command line run dotnet DiscChanger.NET.dll, if necessary with --urls parameter to change the port number. Open web browser to 127.0.0.1:5004 or whatever port number you chose. Click add button to add a changer, select COM port and click 'Test' to ensure it connects. Then hover over all the icons until you locate the scan discs icon. Click that and scan a small subset of discs to see if DiscChanger.NET looks them up correctly before scanning the entire changer contents.
Then if this is all working and you still want to move to the Raspberry Pi, read up on enabling the UARTs as they are disabled by default. Download the ARM32 ASP.NET core runtime onto the Pi, follow the instructions given by Microsoft and use the same dotnet command to run DiscChanger.NET. Use web browser either on the Pi or from another device to see the DiscChanger.NET page. Add changer. I enabled UART2 on my Pi4 and the serial port to choose was /dev/ttyAMA1. See https://community.openhab.org/t/raspberry-pi-4b-serial-port/91750
Cool thing about the Pi4 is that it has so many serial ports (need 3.3V GPIO to rs-232 adapters for each one!) so you can drive five cx777es changers just from the on-board real PL011 (not mini) UARTs.
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