Mario. wrote: > Jon, I believe you have a very clear idea how to make a program ;-) > So, you make serially attached switches (homing and end switches) that > each sends his own message in the same serial line. Use a differential > current driven twisted pair with termination at each point. Basically > you will want many senders and one receiver. Because the events will > be asynchronous, each sending unit needs to have a different message > repeat frequency. Well, you can even make it analog with each switch > turning on injecting of a specific tone into the line! What you need > to do the most is to calculate what transmission and repeat speeds > would be most useful. But I think about 1 Mbaud would be adequate even > for fast homing. ... still another wonderful option is a pulse train > technique. That one is colisionless. > So, we have to have a board with a microprocessor on it for EVERY switch? Hmm, let's see, 3 axes x 3 switches = 9 microprocessors, all to deal with a couple pins on a connector? No, I'm sorry, I really don't think this makes sense. Having the right number of pins to do the job is the most sensible scheme.
Jon ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
