The issue with sharing encoder signals with both the Gecko servo driver and the PC comes from the fact that the step and direction signals into the Gecko are optically isolated and the encoder and its signal exist on the other side of the isolation barrier.
Maintaining the isolation and sharing the signals will require some additional hardware such as this: http://pico-systems.com/gecko.html Regards, Steve Stallings > -----Original Message----- > From: Viesturs Lacis [mailto:viesturs.la...@gmail.com] > Sent: Monday, April 09, 2012 4:16 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Mesa counter card? > > 2012/4/9 Jeshua Lacock <jes...@3dtopo.com>: > > > > How is that possible? The encoders are connected to the > Geckos, not through the parallel port.. > > I do not understand, what exactly is not clear to You :) > AFAIK Gecko drives will need the encoder signal for them to function, > so each encoder signal will have to be splitted/doubled/copied to both > PC and Gecko drive. > I guess that currently we have a basic misunderstanding due to things > not explicitly explained. And I see that You have not explicitly > explained, what exactly do You currently have in Your machine. > >From the way You wrote Your first message I understand that You > already have a working system with encoder signal going also to PC: > 2012/4/6 Jeshua Lacock <jes...@3dtopo.com>: > > > > My Z axis is about 10,000 lines per inch, so it uses up my > available bandwidth really fast. Right now I have the Z's max > speed set to a mere 3 inches per sec. My Y is 24 inches per > sec, and X is 10 inches per sec. That uses up my available 71khz. > > > > So, I understand that something like Mesa's 4I30 4 channel > quadrature counter card will allow me much more bandwidth to > run my servos faster. > > > > What kind of "10,000 lines per inch" are You talking about, if that is > not encoder signal? It could be also step signal, but encoders were > the only thing discussed in that message... > > Could You, please, expand on what exactly You have there? Where are > encoders currently connected? > > Viesturs > > -------------------------------------------------------------- > ---------------- > For Developers, A Lot Can Happen In A Second. > Boundary is the first to Know...and Tell You. > Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! > http://p.sf.net/sfu/Boundary-d2dvs2 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ For Developers, A Lot Can Happen In A Second. Boundary is the first to Know...and Tell You. Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! http://p.sf.net/sfu/Boundary-d2dvs2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
