It's not quite like that. Forgive me if this is not strictly technically accurate but I see it like this - When you read a sensor the signal goes out to the sensor. The sensor then reads and does the conversion calculation which takes some time, about 0.75 seconds I think. It then transmits the result back to the adapter.
There is a directory called simultaneous and in there is a file called temperature. If you write 1 to that file it causes all of the sensors to perform the read and conversion, taking about the same as for one, but all together, so when you read them it is much, much faster. You actually read the standard registers not uncached. Note - this only works if the system is powered. My network has a HobbyBoards 6 port hub and I have never got it to work through that, don't know why. On 27/09/13 07:07, Markus Gaugusch wrote: > Hi, > > I've got 16 ds18s20 and two DS28EA00 ony my 1wire network. > Currently, I read them sequentially every 5 minutes and write the values > into an RRD and a mysql database. > > Now my question: I've read about the "simultaneous" feature, but I don't > know how it works. Does it only work with the ds18s20 or also with the > DS28EA00 chips? > > thanks :) > Markus > > ------------------------------------------------------------------------------ > 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=60133471&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=60133471&iu=/4140/ostg.clktrk _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
