On Fri, 2007-12-28 at 15:11 -0600, Jeff Epler wrote: > (there are, or at least > were, similar board designs with RS232 or TTL serial instead of USB), > you run into bandwidth limits -- you can't quite transmit 12 bytes every > 1ms at 115200bps, and with the protocol I used, it takes 12 bytes to > read or write all the pins.
I was looking at the Pixie and it's application to running Fanuc servo drives and it looks like they use a mixed mode connection. Seven wires that are labeled like this. To Pixie Step Direction Ground Serial tx (pin 3) To PC Fault Serial rx (pin 2) Both Serial ground (pin 5) This would not get us around the PC's upper bound in PPS but it would allow for feedback of position to the PC and perhaps velocity to the servo drive. I can just hear the screams of all my pure servo buddies. There are quite a few high end servo drives that permit step in. Rayh ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
