The core issue with Windows 10 is its stringent driver signature enforcement. Drivers written for Windows XP/7 (common for the 721) are often unsigned or use deprecated architectures.

Follow these steps precisely to ensure Windows 10 maps the virtual COM port correctly. Step 1: Prep the Hardware Unplug the plotter's USB cable from your computer. Turn the cutting plotter off. Step 2: Install the Driver Software

Found in some premium or upgraded variants of the 721.

If your plotter uses the CH340 chip, download the driver directly from the official manufacturer website ( WCH-IC ). Look for the CH341SER.EXE installer package which fully supports Windows 10 64-bit.

Installation Steps (USB & Legacy Ports)