If your system doesn't automatically recognize the plotter, follow these steps: MH721 and Win 10 - General discussion - USCutter Forum
Choose Serial/COM Port (do NOT choose USB even if you are using a USB cable). Baud Rate: Most 721 models require a rate of 9600 . 💡 Pro-Tips for Windows 10 MH721 and Win 10 - General discussion - USCutter Forum cutting plotter 721 driver windows 10
If your cutter has an older 9-pin Serial connector and your computer has a Serial port: If your system doesn't automatically recognize the plotter,
If you have the driver installed, the port is correct, but the blade just sits there or moves erratically, try this "secret weapon" used by technicians: the port is correct