> >> 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
I might have to give up SPI. It work excellent, I send packets at a rate of 16kHz although there should be enough time for packets of a rate of 32Khz at current speed and higher speed is possible. I send to four axis and this is handled perfect at a packet rate of 4kHz although a packet rate of 8kHz should be possible and this is 4-8 times more than needed. Unfortunately the isolation barrier circuit have an enable propagation delay of 8.5µs maximum either to low or high while a 11 byte packet take 17.6µs so this delay will use about a third of the bandwidth at 10Mbit/s and it will become worse if packets are smaller or speed increased. Even though SPI is easy to use and perform excellent it might be better to give up because of this enable delay and spend the time on Ethercat. Or maybe the analog REM switch. Or does anybody have a suggestion of cheap SPI switch? Nicklas Karlsson ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
