Look under "Ports (COM & LPT)." You should see a "USB Serial Port" followed by a number (e.g., Configure COM Port Settings Right-click the port and select Properties Ensure the port number is set between for best compatibility with older cutting software. Software Setup
Goldcut JK 721 (often referred to under the Jinka brand) is a popular vinyl cutting plotter. To get it working, you typically need to install a USB-to-Serial driver so your computer can communicate with the hardware via a virtual COM port. Driver Installation Guide driver goldcut jk 721
: Set the port to match the COM number identified in Device Manager (e.g., : Ensure the command language is set to , depending on your specific plotter's firmware. Common Troubleshooting Connection Failed Look under "Ports (COM & LPT)