Setting up network and im pretty new to networking

I originally had my laser connected thru ethernet cable, I set up a router with a 8 port ethernet switch. plug everything into the switch and it cannot find the laser, says it is busy, I am not sure where to start. Any help would be appreciated.

It’s possible that the switch has assigned a different address to something and it’s now conflicting. Start with this and let me know if this works for you: