On Tue, Nov 04, 2008 at 05:42:01AM -0500, Mark Wendt (Contractor) wrote: > Just curious, what size is the pulse "word" and what info > does it contain? Is there a velocity pulse, or are there separate > pulses for step and direction?
Most common are "step and direction". Here's the anatomy of a step&direction waveform: http://linuxcnc.org/docs/html/hal_rtcomps.html#sub:Stepgen-Step-Types Other systems are possible, but rarely seen on stepper drivers. The main ones are: * quadrature (advantage: can have twice as many steps as non-doublestep step+direction) * up/down: pulse "up" to go one way way, pulse "down" to go the other way. (advantage: I don't know of one) * winding activations :from 3 to 5 signals intended to directly control the power transistors that turn individual windings in the stepper motor on or off (advantage: may give slightly simpler external hardware) You can see diagrams of all of those except "up/down" a little further down that page. Jeff ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
