On Thu, 2012-03-15 at 10:56 -0500, Scott Hasse wrote: > I'd prefer not to use the mesa encoder primarily because I want to use > the optical isolation I already have on the 7i37. Additionally with > the firmware setup I have (4 pwm, 4 encoders, 4 stepgens) and the 3rd > 50 pin cable for io like estop and limit I only have one Mesa-based > encoder available with no optical isolation. Ideally I'd like to run > multiple analog inputs. > > Although if I go the weighted sum route I'd be limited by my io as > well. > > It seem I must be doing something wrong with the software encoder > though, as i think it should easily be keeping up with the frequencies > I'm sending, > > Thanks, > > Scott
Opto-isolators might be considered slow. From my experience, they might be good to tens of kilohertz to maybe a hundred kilohertz with the the fast ones setup properly. Data signals generally don't need to be nearly as fast, so I would tend to isolate the data instead of the analog signals. I wonder... these should be pretty fast: http://en.wikipedia.org/wiki/Small_form-factor_pluggable_transceiver http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_1552798_-1 -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ This SF email is sponsosred by: Try Windows Azure free for 90 days Click Here http://p.sf.net/sfu/sfd2d-msazure _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
