Hi Sadie.
Ignore ALL of the above and do the following:
On your Mac settings choose ‘sharing’ and turn on internet sharing from WiFi to Ethernet.
You should then be able to ping and connect to your laser
Nope, just tried that, turned it on to the belkin usb-c LAN, as I have to have an external port as i have a newer mac and of course absolutely nothing…
The top one is my interest, bottom one is the ethernet. I tried manually putting in a different set of numbers, but to no avail. I am so over it haha I called my supplier for the machine and they have said its almost worth just buying a new hp laptop rather than working with mac
For what its worth, I tried all the suggestions here for connecting via Ethernet, and in the end went back to USB, (which had stopped working in the morning) and now its working fine again! 
Jesus christ, I can’t believe how rude you are. You really know how to make someone feel crap. I didn’t over complicate it. For over a week now I’ve been trying to connect it, and I tried simply connecting and following what you said, and no itdidn’t work. But what did work was using an apple airport router as well as the express, which worked straight away. Maybe next time you try to help someone maybe do it with some decency. Not everyone on here is a network guru. Being nice doesn’t kill believe it or not
I’m not familiar at all with Ruida controllers or Lightburn via ethernet, but I’ve worked with computer networks for the better part of the last 25 years so here’s what you can do to make sure communications are working between your Mac and the Ruida.
- In your picture for the Belkin network adapter, change the “Configure IPv4” setting to Static address.
- Set the IP address field to 192.168.1.101 (or anything else that is 192.168.1.xxx between 1 and 254, that isn’t 100)
- Set the Subnet Mask field to 255.255.255.0
- You can leave the Router, DNS Server, and Search domains fields blank as we are only using this link for a host to host connection, so there will be no routing or DNS lookups.
- Verify what @Dave01 said about the Ruida having an address of 192.168.1.100. If it is something other than 192.168.1.xxx, then you will have to manually assign the address on the Ruida controller. Again, I’ve never been in front of one so you may have to check the documentation.
Once these items are set, your Mac should talk to the Ruida no problem. You can check this by opening Terminal and issuing the “ping 192.168.1.100” (or whatever the IP address setting is on the Ruida, no quotes) command. You should get continuous response times in milliseconds. If you get any other errors, something isn’t right. Cancel the operation by Command+C and then close the terminal window. Now I have no experience using Lightburn over ethernet so someone else here may be able to enlighten us on how Lightburn chooses what network to use on multi-homed systems, or if it searches all connected networks. You could also turn your wifi off when you are out connected to the laser before opening Lightburn. This way it will only have one network to search.
I hope this helps.
EDIT: I guess I should’ve read the whole post…nevermind… 
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 
.
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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