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If your Windows 10 computer has a native 9-pin Serial (DB9) port, or if you install a physical PCI-E Serial Card into your desktop PC, you can bypass the USB driver altogether. Running a physical serial cable from the JK 721 to a physical COM1 port completely eliminates driver dropouts and provides the most stable connection possible.

Make sure to note down which COM port number (e.g., COM3, COM4) Windows has assigned to your plotter—this is essential for the next step.

To update the JK 721 cutting plotter driver on Windows 10, follow these steps:

Select as the manufacturer and JK-721 as the model. (If JK-721 is not listed, Jinka 721 or Standard HPGL will work). Set the Connection Type to Direct COM Port .

Guide to Installing and Configuring JK 721 Cutting Plotter Drivers on Windows 10

: Do not connect the plotter to your computer until the driver installation software prompts you to do so, or until after you have run the driver installer. Port Configuration Device Manager by right-clicking the Start button.

This means Windows sees a device but cannot identify the chip.

If you encounter issues with the JK 721 cutting plotter driver on Windows 10, try the following troubleshooting steps:

This usually happens if another software program is trying to use the same COM port, or if the plotter was unplugged and plugged back into a different USB port. Always use the same physical USB port on your PC. If the error persists, open Device Manager, uninstall the COM port driver, unplug the USB, plug it back in, and let Windows refresh the connection. 2. The Plotter Starts Cutting, Then Stops Mid-Way

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