Newer versions of Windows require . If your driver fails to install, you may need to temporarily disable "Driver Signature Enforcement" in your Windows recovery settings. Conclusion
Right-click the installer and select "Run as Administrator." jk 721 cutting plotter driver
Ensure the baud rate in your software matches the plotter's hardware settings (common values are 9600 or 38400). Optimization Settings Newer versions of Windows require
Check if the LCD screen on the JK 721 says "Online." If it's in "Pause" or "Local" mode, it won't receive data. Optimization Settings Check if the LCD screen on
. You should see a "USB-SERIAL CH340" entry with an assigned port like Monster Shop UK 2. Configure Cutting Software
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.
A: Use the "HP-GL Export" plugin from CoolTear. It creates a PLT file, which you then send via "JetSend" (a free serial file sender) to your COM port.