RE: 1-wire on structured cabling

["Nigel Giddings" <nigel.giddings@xxxxxxx>]

Stuart,

I have just started to play about with this.

Rather than have everything in a Star configuration I am attempting to
do one long bus...

I am soldering the DS1820 on the end of CAT5, using two pairs (Bl/Wh &
Gr/Wh (This conforms to the Midon/Dallas convention sort of, see
www.midondesign.com Temp08 manual)), connected together at the sensor
end. The other end I am terminating on a Krone Frame. Two pairs per
sensor. This will allow me to 'jumper' from one sensor pair to another
sensor pair on the Krone frame, effectively making one (very) long bus.
I could also separate into smaller busses at the Krone if the distance
of the bus(es) becomes an issue. Maybe incorporating a 1-wire Hub?

I'm from a telecoms background so I feel very comfortable with Krone
frames, I am using RJ45s elsewhere but didn't think it as efficient for
this situation. Effectively a single Krone strip will terminate 5
sensors and Krone strips can be readily bought on E-Bay for a few quid
each. I also like them because you can use lightning arrestors easily
for long external pairs.

HTH
Nigel

-----Original Message-----
From: Stuart Grimshaw [mailto:stuart@xxxxxxx]
Sent: 15 January 2004 16:56
To: ukha_d@yahoogroups.com
Subject: [ukha_d] 1-wire on structured cableing

Ayone using their structured cableing with 1-wire devices attached to
the end
of runs?

I tried back at my old gaff by crimping a DS1820 into a RJ45 plug and
putting
that into the patch panel in the loft. It seemed to work OK.

My plan was to assign some ports on the panel to be 1-wire only and tie
each
of the pins on the ports in question together. That way each cable
plugged
into the panel would be in paralell and I could just pick a pair and add
the
1-wire device to it.

I nevver got around to testing it at any great length, has anyone done
anything similar?

--
-S


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