Your cutting software must match the settings you just configured in Windows. Open your software (e.g., SignMaster). Go to or Device Settings .
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 cutting plotter 721 driver windows 10
Ensure Hardware Flow Control is selected in both Device Manager and your cutting software. Your cutting software must match the settings you
Set to Hardware (This is crucial for long cuts). Step 4: Software Setup (SignMaster, ArtCut, or Flexi) cutting plotter 721 driver windows 10