I have similar problem and plan to or actually already use CANopen messages. One or more messages of the form 16 bit cob id + 8 bytes payload and 16 bit modbus CRC at the en of the message(s). At least to start with I implement only the parts I need. Real time communication is usually implemented with all payload used for real time communication and there is SDO messages for configuration or similar.
I would be happy to share the little code I have and cooperate. I have still not checked the standards for sending CANopen messages over other medium than CAN networks and any comments about this would be appreciated. Unless you already know it RS-422 is like ordinary UART with full duplex communication and and differential signals which make possible rather high communication speed although only between two nodes. Regards Nicklas Karlsson On Mon, 11 Sep 2017 13:40:09 +0000 "Marius Liebenberg" <[email protected]> wrote: > Hi > I asked this on the EMC list but thought it should be more relevant > here. > > I need to write a custom RS-422 protocol to control a plasma cutter. I > have a mesa 7i44 (amongst other's ) on the system. > I have never used or seen any examples of how to communicate to custom > hardware via the RS-422 on the mesa cards. Is there anyone out there > that has some examples that I can look at to get started please? > Or some advise will do as well thanks. > > > > ----------------------------- > Regards / Groete > > Marius D. Liebenberg > +27 82 698 3251 > +27 12 743 6064 > > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
