RE: 1-Wire network wiring

["Nigel Giddings" <nigel@xxxxxxxxxxxxxx>]

Hi Brian,



I started with the Star Topology you talk about but found that I ran
into difficulties when I reached double figures. I would suggest you
maybe look at terminating on a Krone frame if you want to continue with
a Star Topology.



I have moved onto a single bus arrangement without parasitic power
because it is the most reliable? With the star I found the cable length
was getting very long, every leg returning to Node 0 and this couldn't
have helped with reflections.



I now have a single cat5 running around the house which I splice into
using cat 5 to take the signal to the sensor on two pairs and bring it
back on another two pairs. Therefore electrically it looks like one long
bus. I have used 8 way alarm junction boxes to splice the cables. Again
some sort of solution with Krone punchdown connectors would be easier...



HTH



Nigel



-----Original Message-----
From: Brian Smith [mailto:briview@xxxxxxx]
Sent: 23 October 2007 20:42
To: ukha_d@xxxxxxx
Subject: [ukha_d] 1-Wire network wiring



Sorry if this has been covered before but I've had a good search through
the
archives and can't find anything. I'm looking for some advice as to how
people have wired up their 1-wire networks. I have a number of
temperature
sensors connected up via cat5 from each room to my node 0. I guess it
resembles a star topology and whilst it seems to work fine the wiring is
less than elegant with a number of hacked cat5 fly leads from my patch
panel
joined together with a terminal block. Does anyone have any cheap and
cheerful suggestions as to how I could improve this as I want to add
some
more sensors and my current approach isn't what you'd call scalable?
Also
does anyone have any experience on the number of devices that can be
sustained without the use of a hub? I've only got half a dozen at the
moment but I'm probably looking to add the same again.

Thanks in advance

Brian

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