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Troubleshooting - Connection Issues

Can't connect to the laser

  • Make sure you have any necessary drivers installed for your laser. If your machine came with its own software, you might have to install that in order to get the driver for your device.
  • A common driver for Chinese diode lasers is this one:
  • A driver for Ruida and TopWisdom lasers is available at the end of the LightBurn installer - just check the box for the FTDI driver.
  • If you use a Trocen controller, you might have to install LaserCAD to get their driver.
  • Make sure you are physically connected to the laser, and have chosen the correct type of laser or controller in LightBurn, and the right connection method.
  • Some systems don't automatically connect - you might have to choose the correct port the first time.

Losing connection

The most common reasons for connection loss with USB are:

  • Poor quality USB cables, lacking shielding or noise suppression. If your laser came with a cable, try a different one.
  • USB cable length - USB cables are limited to 16 feet. If your cable is longer than this, it may need an amplifier or active extension for the signal to remain strong enough to be read correctly at the other end.
  • Another device on the same circuit as your laser, like a mini-fridge, air compressor, water chiller, etc. Any of these things powering up may cause a small power drop that can make the laser 'brown out' and temporarily disconnect or reset.
  • Poor grounding - if your laser is not grounded, static build-up can eventually discharge through the USB connection. This is especially common with lasers driven by belts that interact with plastic wheels. Tying the frame of the laser to a ground connection can eliminate this.

USB port sleeping

If it thinks a connection is idle, Windows can put the port into a power-save mode, which can make your device stop talking to it. This is especially common with laptops.

If you are having issues where you often lose the USB connection after a period of time, try the following:

Windows 7: 54

Windows 10: 202