Hi Jan, Thanks. Lets see if I can get the slave to respond then.
Roland. On 5/21/07, Jan Kiszka <[EMAIL PROTECTED]> wrote: > roland Tollenaar wrote: > > Hi > > > >> A full-text search over 2.6.21 didn't show me which source file is > >> involved here. :-/ > > > > Sorry, memory failed me here (did not have the other box present). I > > just dug out the other PC and checked. Its called natsemi. Also > > checked the rtnet/modules directory but I don;t see anything similar > > in it. > > But you are lucky: it's there, just waiting to be enabled during RTnet > configuration. > > > > >> >> Rarely impossible, only few hardware is so weird that you cannot > >> >> convince it to send/receive deterministically given a non-chaotic > >> >> network (like RTmac/TDMA, Ethercat, or other RT protocols ensure). > >> > Sounds difficult if one has little experience with this. I am just > >> > starting to read your paper "RTnet-A flexible Hard Real-Time Networking > >> > Framework" so you can imagine that I am probably not quite up to the > >> task. > >> > > > > >> You should be able to test a look for your specific scenario. I wonder > >> if EML against the rtlo device wouldn't be much like an empty Ethercat > >> bus. So you should be able to test the elementary cycle - though without > >> process data transfer... > > Ok. > > > >> > >> Ethercat forms a ring: The master sends out a frame that is handled > >> on-the-fly by the slaves as it passes through them. That frame arrives > >> back at the RX line of the master's NIC and is thus received just like a > >> frame sent by some peer node in a normal Ethernet. > > This was new to me, great to learn. But rtnet (forgetting EML) also > > looks for slaves when set up as master. What response is it waiting > > for? Is that an ARP broadcast to specific addresses to which it is > > awaiting a reply? > > If RTnet is using its full stack, there is (besides TDMA medium access > control) RTcfg traffic on the wire, kind of ARP. But those protocols > will not work over rt_loopback. > > Jan > > > ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ RTnet-users mailing list RTnet-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rtnet-users
