On 22.10.17 10:44, Nicklas Karlsson wrote: > On Sun, 22 Oct 2017 17:37:40 +1100 > Erik Christiansen <dva...@internode.on.net> wrote: > > If you use a little RS485 Tx/Rx chip at each end, then that'll absorb 7v > > of ground offset without further ado. > > Yes balanced signal RS485 is good. I changed to isolated gate driver > and then there is no need for isolation on SPI. Then distance is > longer or network larger I could add an Ethercat module or use micro > controller with builtin Ethercat.
Yup, RS485 will do 1.2 km in one hop, but it won't do anywhere near 10 Mb/s on that length, so you'd need repeaters, e.g. a pair of sn65lbc179 chips for each full duplex hop. Some RS485 chips will do over 60 Mb/s, but then you'd need a lot more repeaters for long distances. There are RS485 chips with low input loading, allowing up to 256 nodes on a multipoint bus. That'd be a big machine shop too, and might warrant a second serial bus, or more, for unlimited node count. Erik ------------------------------------------------------------------------------ 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
