> If Ethernet is "complex" then PowerLink is "very complex" as it is a few > layers over top of Ethernet. > > Is there a list of requirements some place? What are the end points, > processes that run on a CPU of some kind. > > I've been doing this kind of work for ages but you can't select anything > without a detailed set of requirements
It is rather simple to send or receive via UDP/IP or TCP/IP for example via Ethernet. UDP/IP is one way packets. TCP/IP send acknowledge which add bandwidth requirement in the opposite direction. To make sure packets within a particular time period may however be harder. Then sending point to point over an ordinary serial channel like UART or SPI data usually arrive practically instantly and there are no collisions. UART or SPI is also very cheap. Software for simple point to point may also be very simple. A bus have huge advantages then it come to number of nodes but there may be collisions. Even though collisions are a small problem to make it work perfect during periodic communication may be surprisingly hard while for a simple serial channel it is no problem at all. Regards 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
