Do not connect the plotter to the USB port yet.
Follow these steps to successfully connect your JK 721 plotter to a Windows PC. Step 1: Download the Correct Driver
Always plug the JK 721 into the exact same USB port on your computer. Plugging it into a different port will cause Windows to assign a new COM port number, breaking your software connection.
Connect the USB cable to a direct USB port on your computer (avoid using unpowered USB hubs).
The Complete Guide to JK 721 Cutting Plotter Drivers: Installation, Setup, and Troubleshooting
Key specifications to be aware of include:
| Issue | Possible Solution | | :--- | :--- | | | Download and install the CH341SER driver manually. If you are using Windows 10/11, ensure that "Driver Signature Enforcement" is disabled if the driver is not signed. | | No communication to cutter | Check the COM port number in Device Manager (Ports COM & LPT). You must select the exact same COM port number in your cutting software, i.e., COM3 or COM5 . | | Computer crashes/Green Screen | This often happens when the print driver is set up incorrectly. Ensure you are not trying to "Print" to the plotter as if it were a paper printer. Use dedicated cut/plot commands from within supported software instead. | | MacOS Connection issues | Macs rarely support the JK 721 via a direct USB-to-USB cable. Use a USB-to-RS232 Serial Adapter with an FTDI Chipset . Cheaper chipsets will not work on Mac. Install the FTDI VCP drivers for MacOS. |
Once Windows recognizes the port, you must configure your sign-making software to route the vector paths to that specific port. Configuration Settings for SignMaster / Artcut / Flexi
If you do not have a disc drive, visit the official manufacturer website or a trusted distributor support page to download the or the specific JK721 USB driver package .
For most Chinese JK 721 models, the CH340/CH341 driver set works best. 3. Installation Guide for Windows 10/11
Search for "CH340 USB to Serial driver Windows" or download it from the official manufacturer's website (WCH). 2. The FTDI or PL2303 Chipset Driver
Ultimate Guide to JK 721 Cutting Plotter Drivers: Installation, Setup, and Troubleshooting
Run the setup.exe or install.exe file and follow the on-screen instructions.
Older Prolific chips face compatibility issues on Windows 11 due to discontinued official support, requiring older, rolled-back driver versions. Step-by-Step Installation Guide for Windows (10 & 11)
The JK 721 supports both USB and Serial (COM) connections. Each has advantages: