Starting rtnet with "rtnet start" on the slave 10.0.0.5, i have seen that time difference with the master is about 19microsec (min 19, max 20).
With ethereal i do LAN sniffing, running ethereal on rteth0 on master, 10.0.0.4.
With ethereal i see TDMA Synchronisation, Heartbeats and so on...
Just to understand about timing: i see the tdma Synchronisation at time 0.608994 and the following heartbeat of the slave 10.0.0.5 to the master at time 0.609136. The difference is 142 microsec, so the heartbeat of slave 10.0.0.5 arrives at master after 142 microsec since the synchronisation. Now considering the tdma.conf i have written gives slot
0 0 to master
and slot
0 120 to slave
(the cycle is 1000)
i can say that the heartbeat start at 120microsec after synchronisation, so the real time the heartbeat (60 bytes) hold the cable is
142 - 120 = 42 microsecs.
Now, i want to understand: i do have to add the delay (19 microsecs) of the slave 10.0.0.5 to this time to calculate the real time the heartbeat holds the cable? What is the relation of this delay on the times i do snif with ethereal, on master?
Tery
--
Teresa Noviello
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