On Thu, Sep 15, 2011 at 06:13:20AM -0400, gene heskett wrote: > On Thursday, September 15, 2011 05:50:08 AM Ben Jackson did opine: > > > I have pin 1 of my parallel port connected to a relay that isn't driving > > anything yet. When I start EMC2 I hear it click on/off. > > My stepperconfig generated .hal says parport.0.pin-1 is estop_out. I > believe this is the commonly used pin for that.
I am not using it for that. > > This might be happening with other outputs as well -- I always noticed a > > stepper clonk at startup which might be the drivers enabling briefly. > > More than likely, that is the drivers powering up the motors, and not > having a history of where in the microstep 'cycle' the motors may have been > when powered down or emc stopped, they instead go to a fixed, full step std Actually it's the reverse. The stepper drivers know the microstep, but with the enable low they are not driving the motors. They have relaxed to a full step. When EMC starts the pin tied to "amp-enable-out" is going high momentarily. That jerks the motors to the partial step and then they relax back again. After I posted this I read about the origin of "probe_parport" and now I am suspecting that module is responsible. I'll remove it temporarily to see next time I'm working on it. -- Ben Jackson AD7GD <[email protected]> http://www.ben.com/ ------------------------------------------------------------------------------ Doing More with Less: The Next Generation Virtual Desktop What are the key obstacles that have prevented many mid-market businesses from deploying virtual desktops? How do next-generation virtual desktops provide companies an easier-to-deploy, easier-to-manage and more affordable virtual desktop model.http://www.accelacomm.com/jaw/sfnl/114/51426474/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
