Dear all,

I would like to implement the RTnet protocol on a small a microcontroler. As 
far, I have working a TDMA discipline which is able to synchronize with a 
master (PC with Xenomai). Also, I have working non rt UDP stack implemented on 
top of the FreeRTOS. In the next step I plan to send a UDP frames through a 
RTmac. At this point I have small uncertainty, how whole ethernet frame 
containing a RT UDP looks like? I assume that sending a standard UDP frame in a 
node slot is not a point. Is the 
following frame correct?

----------------------------------------------------------------------------------------------------------
|                           |                         |                  |      
              |            |
|  Ethernet header  |  RTmac header  |  IP header  |  UDP header |  DATA  |
|                           |                         |                  |      
              |            |
----------------------------------------------------------------------------------------------------------

Ethertype = 0x9021

If this is a RT UDP frame, how looks like RTmac header:
  - Type     = ???,
  - Version = 0x02,
  - Flags    = 0x01 ???

Could you please shed light on this issue?

Best regards,
Mariusz



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