On 6 November 2015 at 23:33, Jan Kandziora <j...@gmx.de> wrote: > Am 06.11.2015 um 23:35 schrieb Colin Law: >> >> What twisted pair does do is to reduce electromagnetic pickup. > ... > > But it is the also the reason it doesn't work this way for onewire. > Because onewire devices don't have symetric transmitters and receivers > but single-ended ones. Not two wires plus ground but only one plus ground. > > When you connect the ground line to data-, you have a different current > on the common ground/data- line because the ground line also carries the > supply current. So there's no way the receiver can successfully > eliminate line noise. Instead, it picks up supply current noise. It just > doesn't work.
Does that argument hold in the case of parasitic power, where the data and common lines do carry the same current? Colin ------------------------------------------------------------------------------ _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
