From: Marc M. <ma...@me...> - 2009-09-20 15:26:29
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On Sun, Sep 20, 2009 at 11:02:09AM -0400, Jim Serack wrote: > With regards to your cabling plan might want to read this > http://www.maxim-ic.com/appnotes.cfm/an_pk/148 which is Guidelines for > Reliable Long Line 1-WireR Networks written by the Dallas integrated circuit > designers. Basically a stub or star greater than 3 meters off the loop > wiring should be avoided. If you are going to star wire - you should use a > hub. Now - you may find it works with longer stubs - but there is no way to > tell how close to marginal it is - unless you have access to some expensive > digital storage scopes, AND, it will be data (read temperature) dependent. > > I have wired all my "one-wire" as Cat5 using 3 wires - although in most > cases the "power" is grounded at the master end. I have about 250 ft of > wiring including runs in conduit to the pool. Cool, thanks for that info. No, may I ask which interface you are using on the PC side and how you are reading the data? (command line? from mh? other?) Thanks, Marc -- "A mouse is a device used to point at the xterm you want to type in" - A.S.R. Microsoft is to operating systems & security .... .... what McDonalds is to gourmet cooking Home page: http://marc.merlins.org/ |