When wanting to connect via Ethernet, you tell LightBurn the address of the device in the ‘Device Profile’. This information is covered in the other post I provided.
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192.168.1.100 is the default IP address for every Ruida controller, and it is static, not DHCP.
Like you said before, but they had a “tech” out there for 8 hours doing god-knows-what.
Trust But Verify 
We agree 100%. The culture we promote is of inclusivity. We strive to offer a welcoming place for members of every knowledge level. Please accept our apology. You are always welcome to post questions. We will do our best to assist, facilitate solutions and provide resolution procedures and workflows, all with the goal of enjoying the lasing experience.
On the original issue, we are here to help. I see some nice ‘step-by-step’ replies to help as well. Update when you can, and we can go from there. 
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That comes directly from the Ruida CTO. Every Ruida leaves the factory with a default IP address of 192.168.1.100. If the laser machine manufacturer plays with it and changes it, that’s out of their hands. If you default the controller back to factory settings, that’s what you get for an IP address.
All good now guys. I have managed to get my hands on the apple airport extreme and the express which is connected to the machine through ethernet cable and It connect straight away, Mac clearly talks better to Mac products. So I don’t even need a cord going directly to the computer, all wireless:) dad had these just lying around so luckily it didn’t cost me a penny! Thanks for all your help guys 
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Great! Thank you for hanging in with us. So glad to hear you got this sorted.
You are right they are not interchangeable but they are both actual USB device connections. The ‘u drive’ port is only used to read/write USB memory sticks or drives, but it is still a working USB port. The max speed is that of USB 1.1 according to what I can find on the Ruida controllers. There was not much on Ethernet speeds.
The Ruida controller is just that. It will talk to anything that knows it’s ‘language’. Many run Linux with Lightburn. Only that RD Works program is a pc only program. It has to ‘talk’ to your router to receive information over the internet, I doubt your router is a pc.
I think what he’s saying is that his mac talks to his wifi router that routes it to the laser controller. Why he can’t plug into the internet himself and talk to it is in question. That should not require special drivers. Connecting to the network port and controlling it via USB like Lightburn/RDWorks are two different animals.
As was pointed out, it’s probably drivers. It seems to me I saw a post about that in the past somewhere…an issue with macs and drivers. This would apply to directly connecting to the USB port.
There are tools out there, I use arp-scan which is Unix based and scans a network to lists all devices.
8 hours? The add says “In-line beam combiner for easy mirror alignment and set-up” Could the tech find the machine or did you have to point it out to them?
Usually for that kind of money you expect a working supported machine. I’m with the others, I’d ship it back to them and get my money back.
Best of luck… Take care. (8’)
The solutions has been found, but thanks for your input.
The machine isn’t the problem, it’s a fantastic machine and it doesn’t need to be sent back.
He had to set up the whole machine, and then we has issues with the lenses etc, hence why it took so long.
Glad to hear it’s up and running ok. Take care.
Hi,
I had the same problem but with a windows PC 
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My laser was connected through a switch connected to a LAN. All devices use DHCP except the laser the Ruida leave no choice between fixed or free DHCP addres, only a fix adres.
I can tell you that a router only uses al ip addresses above 100, so normally all IP addresses below 100 are free tu use and stays fixed.
Hope that this can help you.
Raoul
Hi Sadie, and glad your laser is finally working.
I’ll just toss this into the discussion, in case it’s helpful to someone else finding your post:
You typically can’t connect a computer directly to a peripheral with an Ethernet cable.
Ethernet cables are either wired as "straight-through (very common), or “crossover”.
The common scenario is a router or hub in the middle of the network, and straight-through (AKA “patch”) cables from the hub out to each device.
If 2 devices need to connect directly, a “crossover” cable is used.
Crossover cables are sometimes yellow to differentiate them from the typically blue patch cables.
TLDR; not all Ethernet cables are the same.
This used to be true, but it’s not really any more, especially with gigabit Ethernet. Those have ‘Auto-MDI/MDIX’, meaning they just figure it out on their own, and it’s only required that one side have it:
Short version: most modern computers do not need a crossover cable to connect directly to a device.
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