Hi Marc,
Yes, there is a standard… pretty
much (it’s not IEEE or anything, but everyone seems to adhere to it).
You can find the cabling spec here:
http://www.hobby-boards.com/catalog/howto_wiring_diagram.php?referer=howto_connecting.php
Our friends at Hobby Boards were nice
enough to document it well.
Good luck,
Vince
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Marc Gerges
Sent: Sunday, July 16, 2006 6:47
PM
To: [email protected]
Subject: [Owfs-developers] Cabling
over Ethernet
Dear all --
I'm not sure if this borders the topic or if it's way out - apologies if it's
the latter.
I have been using DS1820's with OWFS for some time. The place has ethernet
cabling that brings all the rooms into a central patch panel. In order only to
use a single jack, I wired pins 1 and 2 as Data and Ground into the sensor, and
then 7 and 8 back from the sensor. In the patch panel I used 2 strings of ISDN
cable (flat, 4 wires) crimped into one RJ45 connector and connected from one
jack to the next - that way the bus topology was correct. When temporarily
pulling a sensor, I used a bridged connector to fill the gap.
Now I'm starting to use counters and switches, so I need 5V on my bus. Is there
a standardized way to set up cabling for this? should I just put +5V and GN on
pins 3 and 4 resp. 5 and 6 and bridge it through at the other end, or is there
some standardized way to handle this? I found lots of different examples on the
net, however they never seem to bring the signal back from the port and therefore
seem to violate the bus setup. Is that permissible? I have around a dozen
sensors/actors (bound to become more) and a total cable length of maybe 100
meters, high quality CAT7.
How do you handle this kind of setup?
Marc
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