Paul Alfille wrote: Hi Paul, Hi all,
> I think we have that "feature". > > Just ask for the device, even if it isn't in the directory listing. We only > cache existence, not non-existence. Ah, that's good. > Now your 1-wire topology will give the purists fits. I'm no expert, but > having a splitter risks signal reflections that confuse the adapter. There > is pleanty written on the subject, or you can make your own empirical > tests. Not just the purists - me, too! ;) So far, I've found out that it's often the sensors at the end of the longer branches that cause problems. As a proper 1wire "switch" would cost as much as all my current 1wire hardware together, this is not really an option for me right now. I'll have to compromise for the time being, as I'm also unable to rewire the sensors. I will try to cut down wire lengths and implement a higher-level "retry" mechanism with time backoff in my scripts, and I'll just have to live with a bit of instability - 3 or 4 errors per day even without any retries ( I assume that owfs does not attempt any retries in that situation ) is not that bad, after all :) As I wrote, in my network, the DS9097U serial adaptor is connected directly to my PC, then follow 80 feet of Cat5 cable, then the splitter with 6 branches of 5 to 15 feet. Does anyone know whether moving the DS9097U adaptor really close to the hub, i.e. to have 80 feet of serial port cable instead of 80 feet of 1wire bus, would help in my situation? I know that an 80 feet serial port cable is no problem at all if it's a regular null-modem link between two PCs, but the question is whether the reflections etc. caused on the 1wire bus by my flaky setup would just propagate to the serial port cable, too... ? Philipp ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
