Steve Blackmore wrote: > On Wed, 19 Aug 2009 16:57:43 -0400, you wrote: > > >>> PC is dual boot with Windows XP, ran Mach3 at 35kHz Kernel speed and >>> it's capable of seeing the index pulse and giving an accurate rpm >>> reading to 1000 rpm! I find it odd that Mach can use it but EMC can't >>> above 200 rpm? Any ideas? >>> >>> >>> >> It's probably related to the fact that you are running EMC2 at the >> equivalent of a 16 kHz kernel. (unless you changed your base period >> > >from 62500) > > If it's approx half the Mach kernel value, I'd expect it to be able to > see nearer 500 rpm, not just 200? > > Art has a LOT of trickery in his driver. I'll bet he checks for the index pulse both at the beginning and the END of his driver, doubling the likelihood of catching a short pulse.
Jon > Worst latency I've managed to get doing several things at once and > running a GL screensaver in a window is 12uS. Pulse diagram for drives > shows a 1uS rise and fall time and a minimum duration of 2.5uS, > direction must lead the rise by 2.5uS or greater. > > I'll try dropping the base period some after I've fitted the other > encoder and repeat the test. > > The 62500 figure came from stepconf. > > Steve Blackmore > -- > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day > trial. Simplify your report design, integration and deployment - and focus on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
