On Wed, 7 Jun 2006, Jan Kandziora wrote: > Am Mittwoch, 7. Juni 2006 21:44 schrieb Paul Alfille: >> Actually, I have some alternative timing settings suggested by William >> Robison that we could try. >> >> It's been hard to justify changing anything until we had test networks that >> could be compared. >> >> I'll add it in, at least temporarily, add a command line flag, and package >> it up. >> >> In the long run there are 3 cases: >> 1. Old time best >> 2. New timking best >> 3. Varies by network. >> > Oh, there's actually another tweak Michael could try: Maxim supposes to add an > RC circuit for medium length busses. Michael, see App. D of > > http://pdfserv.maxim-ic.com/en/an/AN148.pdf > > The whole document would be interesting to you, I think. > > Kind regards > > Jan
Thanks for the suggestions. We are actually implementing the filter, but since the network is in a slightly remote location (an observatory on Tenrife, where I only go to fix problems) I was looking for a solution I could try remotely. The network is indeed a mixed topology, it consists of 2 Hubs, about 5-10m apart from each other (and the master). We splitted it up (it was a bit more complicated before) but that did not improve matters. Nor did using USB instead of rs232. I will try the filter (I also take an oscilloscope to measure timings and voltages) next week, but I would still like to play around with timings (Maxim says something about 5us pulldown time for the 5Volts, which should be tuned by the timing setting. Any suggestions to where I could insert some timing related changes in the source code? Preferably changeable at runtime, but thats not really important. Thanks again, Michael _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
