: This is the most common chip for these plotters. You can download it from reliable repositories like Driver Scape CH340 specialized sites FTDI Driver
If you encounter issues with your RoHS Cutting Plotter 721 drivers or plotter operation, try:
Windows 10 often fails to automatically fetch legacy serial drivers. Follow these steps to install them manually. Option A: The CH340 Driver (Most Common)
Select the exact (e.g., COM3) that you verified in the Device Manager.
Write down this COM port number. You will need it later. Step 3: Configure Device Manager Settings
If the built-in USB port on your ROHS 721 fails to work reliably with Windows 10, consider using the plotter’s RS-232 serial port with a quality USB-to-serial adapter (e.g., from Tripp Lite or Startech). Install the adapter’s Windows 10 driver, then connect the plotter via a null-modem cable. This often bypasses driver conflicts entirely.
Plug the USB cable firmly into a back panel USB 2.0 port on your computer (avoid blue USB 3.0 ports, as they can cause data timing issues with legacy serial emulation). Flip the power switch on the ROHS 721 plotter.