Bert has me interested in this stuff as well. Here are some links for for the EtherCat protocol, and for a slave product by Beckhoff that works with a PIC chip and C code.
EtherCat: ethercat-1.5-6129a5f715fb.pdf
EtherCat slave info: http://download.beckhoff.com/downloa...L9800_V1i1.pdf
EtherCat EL9800 Board: http://www.ethercat.org/en/products/...2DEABC1474.htm
EtherCat EL9800 Board PDF: http://download.beckhoff.com/downloa...00e_Ver3.0.pdf
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