Dave wrote: >>> Does Mesa already >>> > handle > this protocol? > > Peter said that they can get the data into the hardware but that there > is no driver support for it yet. > > I need to get an SSI encoder. > Well, it seems like it wouldn't be all that hard to adapt my PPMC encoder card to handle this protocol, or maybe make an SSI to quadrature converter. If the SSI code can be interrogated fast enough, then the delay caused by converting serial to quadrature won't bother the loop stability much. I'm guessing from some of the data I read that the encoder could be read out perhaps every 20 us or so.
The advantage of making an SSI to quadrature converter is that there won't be any driver issues, and then the encoder can be used with a variety of servo systems. I have this board that I made for Fanuc encoders, but it has both differential receivers and drivers and a Xilinx XC2C128 CPLD, which might have enough capacity to do the conversion. If you have a small encoder I could borrow for a few weeks, I would like to give it a try. Jon ------------------------------------------------------------------------------ vRanger cuts backup time in half-while increasing security. With the market-leading solution for virtual backup and recovery, you get blazing-fast, flexible, and affordable data protection. Download your free trial now. http://p.sf.net/sfu/quest-d2dcopy1 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
