On Tuesday, April 10, 2012 11:07:55 AM Dave did opine: > 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 Potentially a poor choice of words there, Steve. Badly thought out designs can always be fixed unless some yahoo potted it in epoxy. Never having seen a G540, I don't know that it isn't, but...
> 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 Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Tact is the art of making a point without making an enemy. ------------------------------------------------------------------------------ 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
