On 4/10/2012 9:56 AM, Steve Stallings wrote: >> -----Original Message----- >> From: Sebastian Kuzminsky [mailto:[email protected]] >> Sent: Monday, April 09, 2012 6:02 PM >> To: Enhanced Machine Controller (EMC) >> Subject: Re: [Emc-users] Hal_parport and EPP >> >> > <snip> > >> Simply switching the port to EPP mode doesn't accomplish anything. >> >> > Simply switching the port to EPP mode DOES accomplish > one significant thing. Those outputs that are open collector > with pull-ups in regular mode become Totem-Pole driven > outputs when in EPP mode. This change is significant > for the Gecko G540 which needs the extra drive current > when the output is a logic one. The inputs to the G540 > are unbuffered optocoupler LEDs and there is no source > of power on that side of the interface in the G540, so > adding a buffer or additional pull-ups inside the G540 > is not possible. > > Steve Stallings > > > > Now the G540 circuitry makes sense. I never thought about the optos.
Thanks for the clarification. Dave ------------------------------------------------------------------------------ Better than sec? Nothing is better than sec when it comes to monitoring Big Data applications. Try Boundary one-second resolution app monitoring today. Free. http://p.sf.net/sfu/Boundary-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
