2017-09-17, 19:53
This day and age ethernet crossover cables aren't required. The ports work out between themselves which is to talk down which pair. Even the lowly ENC28J60 chip used for the ethernet port on the controller can do this, just tested that...
Assuming that anything plugged into the "switch" can access the internet via the "router", plug the controller into the switch. Then look in the routers DHCP table for the IP address it has given to the MAC address of your controller. Enter that IP address into a browser and you should get the controllers home page returned. Bit of a Catch 22 is that there is no easy way to know the controllers MAC address without using the web interface. So just look for recently issued leases, or just try each IP address untill you get the controller.
Assuming that anything plugged into the "switch" can access the internet via the "router", plug the controller into the switch. Then look in the routers DHCP table for the IP address it has given to the MAC address of your controller. Enter that IP address into a browser and you should get the controllers home page returned. Bit of a Catch 22 is that there is no easy way to know the controllers MAC address without using the web interface. So just look for recently issued leases, or just try each IP address untill you get the controller.