Sometimes Windows assigns a high COM port number (like COM15) that older software cannot read. In Device Manager, right-click the driver > Properties > Port Settings > Advanced, and change it to a lower number like COM1 or COM2.
The driver alone will not cut your vinyl; you must pair it with software. Here is how to configure the most common programs for the JK 721. SignMaster Setup jk 721 cutting plotter driver
Set the Brand/Model to or Refine , and select JK-721 (if not listed, select Redsail or Generic DM/PL , as they share language commands). Set the Connection type to Direct COM Port . Sometimes Windows assigns a high COM port number
You will need this exact number later.
Drivers alone won't cut your designs; you need a software interface to send vector files to the machine. Software for JinKa JK-721 plotter - PlotCalc Here is how to configure the most common
If your JK 721 came with a CD, the driver folder will typically contain a file named CH341SER.EXE or a driver utility specific to Windows.
Users have reported that the Windows 10 version sometimes works with older drivers or even without a specific manufacturer driver. One user discovered that "I did not need the original driver for the cutter either as Windows 10 supported it without installing any. When the cutter was plugged in it showed up in device manager under Ports (Com LPT) as USB SERIAL CH340 (COM5)".