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. USB cable length - USB cables are limited to 16 feet.If your laser came with a cable, try a different one. Poor quality USB cables, lacking shielding or noise suppression.The most common reasons for connection loss with USB are: (See Connecting to the Laser for details) Some systems don't automatically connect - you might have to choose the correct port the first time.

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.If you use a Trocen controller, you might have to install LaserCAD to get their driver.On Windows systems, a driver for Ruida and TopWisdom controllers is available at the end of the LightBurn installer - just check the box for the FTDI driver.

A common driver for Chinese diode lasers is this one:.

If your machine came with its own software, you might have to install that in order to get the driver for your device.

Make sure you have any necessary drivers installed for your laser.Troubleshooting Troubleshooting - Connection Issues ¶ Can't connect to the laser ¶

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