Atmel AVR2070 Manuel D’Utilisation

 

8240B-AVR-06/09 

E2 FCF 

– 

Data 

0x8861 

Seq 

34 

PID 

0x1234 

R2 SA 

0x0006 

E2 SA 

0x0007

Final Dest 

SA 

0x0000 

Origin SA 

0x0007 

Data 

payload 

 

A data frame from a child node is passed to the coordinator.  The source and 
destination addresses in the 802.15.4 frame header are changed for each hop, but 
the rest of the frame is unchanged.  Final destination and origin addresses do not 
change as the packet progresses through the network. 

A data frame may pass through the coordinator, if the “Dest SA” field is anything but 
0x0000 (coordinator's short address).  Any frame the coordinator sends, whether it is 
relayed through the coordinator or originates with the coordinator, is preceded by a 
routing packet if necessary. 

There are only a few packets used in this system, so structures can be pre-defined for 
each. The key values used to distinguish one frame type from another are the FCF 
value and the MAC Command byte. 

Note that a new MAC command byte of 0xBB has been defined for a routing packet.  
This is of course non-standard; however, it is not expected that other proprietary 
networks are able to route RUM packets, so nodes in another network should never 
have to parse a RUM routing packet. 

Beacon request 

0x0803 

7 

Beacon 0x8000 

- 

Association Request- direct 0xC863 

1 

Association Request- indirect 

0x8863 

1 

Association Response – indirect 

0x8863 

2 

Association Response – direct 

0x8C63 

2 

Routing packet 

0x8863 

0xBB 

Data packet 

0x8861 

-