I don't know of a consensus, but I use the following: Standard 4-conductor colors:
1: VDD (GRN) 2: N/C (YEL) 3: Data (RED) 4: GND (BLK) In an RJ45 jack this gives the following for T568B: 3: VDD (WHT/GRN) 4: N/C (BLU) 5: DATA (WHT/BLU) 6: GRD (GRN) If I did it again, I'd probably swap the Data and VDD wire colors for 4-conductor, as most wired sensors I get use VDD=red, but I had so many DS18B20s wired with this pinout I wanted to be backward compatible. This is the standard pinout for my line of controls. Colin On 10/22/2013 19:42, Andrew Elwell wrote: > Leaping in on this for ideas: > >> That said, the voltage drop should be *unevenly* distributed between Vcc >> and GND, so don't have 2 Vcc wires + 2 GND wires but rather 1 Vcc wire + >> 3 GND wires. Voltage drop on the Vcc line isn't "seen" by the bus >> protocol, on the GND wires it's causing problems. > > In my setup I'm planning on driving 20-30 DS18B20s along a piece of > ~20m cat5 (or higher) cable -- should I therefore use a couple of > spare paies as extra ground connections (such as the brown / w/brown > ones that would otherwise be unconnected?) > > Is there a consensus for the pinouts on rj45/rj12 connectors anywhere > (if anyone knows the pinouts for Rittal PDU sensor port I'll probably > match that, then we can interchage homemade v commercial for > debugging) > > A > > ------------------------------------------------------------------------------ > October Webinars: Code for Performance > Free Intel webinars can help you accelerate application performance. > Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from > the latest Intel processors and coprocessors. See abstracts and register > > http://pubads.g.doubleclick.net/gampad/clk?id=60135991&iu=/4140/ostg.clktrk > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers > ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60135991&iu=/4140/ostg.clktrk _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
