> >> But WHY?  Why bother to repurpose USB and write all that software when
> >> Ethercat is available for free.  Free and Open source Ethercat masters
> >> already run on Linux.
> >
> > How about the hardware, is this principle patented?
> 
> Don't know abut patients but it seems to be available and Open Source and
> works with LinuxCNC
> 
> some instructions here: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?
> EtherCatDriver

Yes and there are hardware available 
http://www.microchip.com/wwwproducts/en/LAN9252 or Beckhoff and SPI may be used 
to communicate with slave controller.

I do not have time right now but will probably add later on. During the mean 
time I could use SPI. First I have to learn more about Ethercat then I have 
todo hardware and then software, it will take quite a lot of time. SPI I 
already tried maybe a month or two ago but had to add a fourth signal to the 
insulation barrier, it will give me at least 5-10 times more bandwidth than 
needed so I could chose to stay.


Nicklas Karlsson

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