On Sat, 2011-01-29 at 16:25 +0330, Farzin Kamangar wrote: > Hi Steve, > During the period between PC on and machine on, some of the parallel port > pins are on which make some outputs on. How do I know which pins are on > during that period and which pins are off. This is all before the time EMC > starts. Thanks > Farzin
This is a common problem and can be handled by using the charge pump feature and a parallel port buffer or breakout board which has an enable input. The charge pump signal is connected to the software "machine ON" button in HAL, then routed to a pump detector, the detector to the buffer enable. This way the signals don't get passed until EMC2 is up and running and the operator signals that she/he is ready. There are other ways to do this, but this is the basic idea. See: http://wiki.linuxcnc.org/emcinfo.pl?About_Charge_Pumps -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
