Leaping in on this for ideas:

> That said, the voltage drop should be *unevenly* distributed between Vcc
> and GND, so don't have 2 Vcc wires + 2 GND wires but rather 1 Vcc wire +
> 3 GND wires. Voltage drop on the Vcc line isn't "seen" by the bus
> protocol, on the GND wires it's causing problems.

In my setup I'm planning on driving 20-30 DS18B20s along a piece of
~20m cat5 (or higher) cable -- should I therefore use a couple of
spare paies as extra ground connections (such as the brown / w/brown
ones that would otherwise be unconnected?)

Is there a consensus for the pinouts on rj45/rj12 connectors anywhere
(if anyone knows the pinouts for Rittal PDU sensor port I'll probably
match that, then we can interchage homemade v commercial for
debugging)

A

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