Back with the same problem...LightBurn cannot find COM3,

[JohnJohn (John Johnson)]

@BarryFriesen

The RDWorks Driver that fixed it last time is not fixing it this time.

Windows 11 has all kinds of strange permissions and requirements.
I would attempt to Install RDWorks as an administrator or roll back the Driver in Windows 11 if it was updated.

@BarryFriesen

the laser is plugged in by USB (COM3 is the name of the port). Computer is plugged into ethernet.

@BarryFriesen

I am plugged into a network/ethernet cable.

The better Ruida controllers can make use of an ethernet cable. A few folks on staff connected their lasers to their switch or router (often mistaken for a modem) and they haven’t looked back.

If you decide to attempt this, please work through the following post to verify your settings.

How do I connect a Ruida controller with Ethernet?

Setting up a Ruida controller to connect via Ethernet isn’t hard, but it’s not quite as simple as just plugging it in. Follow these steps: 1) Get the IP Address of your computer: For Windows: Open a command prompt (click the Start button, type CMD, and hit enter). Type IPCONFIG and press enter. You’ll see something like this: [image] The one labeled ‘IPv4 Address’ is the interesting part - this is the network address of your computer on your local network. The first 3 groups of numbers …