Me120 Driver | Marrison

Ensure you are using the correct USB port. If the device isn't recognized, check your Hardware IDs (e.g., USBPRINT\MARRISON_ME120 ) in the Windows Device Manager to verify the connection.

| Error Message | Likely Cause | Solution | | :--- | :--- | :--- | | | Conflicting driver (e.g., Samsung USB driver) | Go to Device Manager > Uninstall device > Check "Delete driver software" > Reinstall CH340. | | Code 43 – Device descriptor failed | Faulty USB cable or power brown-out | Use a shielded USB 2.0 cable. Do not use a USB hub. Provide external 24V to the ME120. | | Driver not signed error | Windows 11 security enforcement | Use pnputil /add-driver method (see advanced section below). | | COM port disappears after reboot | Power saving enabled | Device Manager > Ports > Properties > Power Management > Uncheck "Allow computer to turn off this device." | | Software cannot find ME120 | Baud rate mismatch | Set the config tool to 115200 baud, 8 data bits, 1 stop bit, no parity. | marrison me120 driver