Sebastian Kuzminsky wrote: >Gerhard Pircher wrote: > > >>>If your spindle is not reversible you could connect the step line to >>>either Up or Down, and run it that way. >>> >>> >>Well, it is reversible. Maybe I should build a simple step/dir to >>quadrature converter. That shouldn't be too hard. >> >>Thanks for enlightening me! >> >> >It might be simple to use the Dir line from your spindle as the selector >to a demux, and send the Step signal to either Up or Down on the hm2 >encoder input. > > That's a good idea, with a couple of caveats:
1) There is no demux component ;) 2) When someone writes one, they will need to be careful about what happens to the unused output - there shouldn't be any unexpected transitions on the "other" output 3) There could be several counts in the wrong direction since counting is done in a MHz-speed "thread" in the FPGA and the demux would only be checked at 1Khz to 10kHz rates. This wouldn't be bad in practice since the spindle would have to slow down before reversing, but it could also be a problem if the spindle is more or less still and the dir line changes out of sunc with the step pulses. - Steve ------------------------------------------------------------------------------ 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
