AFAIK systems "bus based" are very similar, even for home/office electric cabling. In the home/office "domotic" ones there are usually two couples of wires, tw

AFAIK systems "bus based" are very similar, even for home/office electric cabling. In the home/office "domotic" ones there are usually two couples of wires, two are the mains (poass-through) and two are "signal", every device is connected to both. The closest thing in typical networks is - I believe - PoE: https://en.wikipedia.org/wiki/Power_over_Ethernet https://en.wikipedia.org/wiki/Power_over_Ethernet In automotive, normally the frame is 0V or "ground" and you need only a single (big) wire with +12 V and the signal cable/wires.