For an upcoming project I am investigating serial buses. What I have covered so far are RS485, I2C and CAN. Right now I am looking on Ethernet and USB. Questions: 1) Anybody got a pointer to where to learn about ethernet protocol and bus? 2) Are there more buses I like theese above? Thanks in advance /Morgan %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Morgan Olsson ph +46(0)414 70741 MORGANS REGLERTEKNIK fax +46(0)414 70331 H€LLEKS (in A-Z letters: "HALLEKAS") SE-277 35 KIVIK, SWEDEN mrt@iname.com %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%