Most 721 models use a CH340 or FTDI chipset to convert the USB signal into a Serial signal the plotter understands. Windows 10 often fails to recognize these chips automatically, or it installs a "generic" driver that doesn't actually pass data to the cutting software. Step 1: Identify Your Chipset
: Includes built-in drivers for various 721 models—just select your model from the dropdown menu. cutting plotter 721 driver windows 10