On Wednesday 13 July 2016 09:56:43 Leonardo Marsaglia wrote: > Hello to all. > > We just tested some Heindenhain encoders and as happened with other > encoders we can't sense the index pulse. We tried to detect it with a > 20 nano seconds period on a digital scope but nothing happens. All the > other pulses are working perfect except the index one. > > I have to mention that this happened with other encoders too, but > since we didn't need to use them with index pulse on the other > machines we just let it that way and didn't worry about it. > > The trouble is we also tried to detect the index pulse on LinuxCNC but > we never could. Is this because the pulse happens so quickly that we > can't really scope it? Or are we missing something about how to > measure it? > > We're worried because now we need to use the index pulse for homing > our Mazak lathe that we're converting to LinuxCNC. > > Thanks as always for your help!
Perhaps it needs a pullup resistor? What is the resting voltage when its all powered up on this index pulse line? If under a volt on the usual digital DVM, I'd try a 4.7k resistor from it to a 3.3 or 5 volt line. But have a meter or scope on it when you touch the + line with the resistor, and if you don't see pretty close to the + rail, rotate it a few degrees and retry it again. If its stuck down under a volt both times, its time to call Heindenhain & see if we don't know what we're doing. There is always that possibility. Cheers Leonardo, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports.http://sdm.link/zohodev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
