Quoted from RazerX:
So why exactly is this even necessary? Who and why would anyone be scanning their QR code from something other than their phone?
People who just want to print off their card and no mess with their phone? Helpful for a home owner so they can just leave their printed out code sitting on the glass...
Quoted from chuckwurt:
Wild. Didn’t know Ethernet can carry power too.
It's pretty neat. The CAT-6 cable carries the data line between the node boards and a 48V rail that the node boards step down to the voltages they need for different applications (solenoids, LEDs, motors, LCD screens, etc). Reduces a lot of wiring and they can use one 48V switching power supply, instead of a collection of them providing different voltages or a bulkier transformer.