Open Device Manager, right-click the CH340 port, select Update Driver , choose Browse my computer for drivers , and click Let me pick from a list of available drivers . Select the older, functional CH340 driver from the list. Final Tip: Use a Physical Serial Cable if USB Fails
If you need a specific driver or software link, let me know the (e.g., CH340) or if you are using USB or Serial cable , so I can help you find the exact driver file. Software for JinKa JK-721 plotter - PlotCalc Jk 721 Cutting Plotter Driver Windows 10
Do not plug the plotter into your computer yet. Plugging it in prematurely can cause Windows 10 to assign a generic, non-functional driver. Step 2.2: Download the Correct Chipset Driver Most JK 721 plotters rely on the CH340 chipset. Open Device Manager, right-click the CH340 port, select
Note: If it appears under "Other Devices" with a yellow warning symbol, you need to update the driver manually. Software for JinKa JK-721 plotter - PlotCalc Do
By carefully configuring the CH340 virtual serial environment and keeping baud rates aligned, the Jinka JK 721 will operate reliably on any modern Windows 10 build.
To successfully connect a JK 721 to a Windows 10 PC, the following procedure is recommended: