1-Wire bus over Cat6 star topology

[Jeff]

I was thinking about home running Cat cable from several sensor locations,  but creating the bus topology by using 1.5 pairs (V+, Data, Gnd) up the cable to the sensor and then use another 1.5 pairs back to tie into the next home run cable leading the next group of sensors. Per the Dallas 1-wire guidelines, I don't think this is going to exceed the maximum length recommendation. However, I haven't found any references or discussions for sending the network up then back down the same Cat cable.

Just wondering if anyone has tried this before and/or know enough about 1-wire to know if it may or may not be a problem. 

[Kevp]

Hi Jeff,

How many sensors are we talking?

[Tico]

The guidance I received from a different forum was that you don't need to run the V+ out and back. 

So -

1.5 pairs out (V+, Data, Gnd) with Data and GND on a twisted pair.

1 pair back (Data, Gnd)

Leaves you with 3 stands for something else.

[Jeff]

@Kevp, if I fully implemented the sensor network, I'm sure I could max out the network limit for the number of devices. By home running the cat. cable, I could break-up into multiple networks. For discussion purposes, let's say 22 devices per network but one run out and back might have 2 to 6 sensors. 

@Tico - Can you share a link to that forum?

[Tico]

It's the German loxforum, via Google Translate -

https://translate.google.com.au/translate?sl=de&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=https%3A%2F%2Fwww.loxforum.com%2Fforum%2Fverkabelung-installation%2F89575-1-draht-topologie-mit-minimalen-dr%25C3%25A4hten&edit-text=&act=url