Data Transmission And Routing - AG Electronica XBee 2 Series Manual

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XBee Series 2 OEM RF Modules ‐ ZigBee ‐ v1.x2x [2007.07.019]

3.2.3. Data Transmission and Routing

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Figure 3‐03. ZigBee Layer‐Addressing Example
ZigBee Device A
Endpoint 1
Endpoint 2
Endpoint 3
(radio A)
Cluster ID = TurnLightOff
All data packets are addressed using both device and application layer addressing fields. Data can
be sent as a broadcast, multicast, or unicast transmission.
Broadcast Transmissions
Broadcast transmissions within the ZigBee protocol are intended to be propagated throughout the
entire network such that all nodes receive the transmission. To accomplish this, all devices that
receive a broadcast transmission will retransmit the packet 3 times.
Figure 3‐04. Broadcast Data Transmission
E
L eg en d
C = C o o rd in ato r
E
R = R o u ter
E = E n d D evice
Each node that transmits the broadcast will also create an entry in a local broadcast transmission
table. This entry is used to keep track of each received broadcast packet to ensure the packets are
© 2007 Digi International, Inc.
ZigBee Device B
Endpoint 40
Endpoint 41
(radio B)
Endpoint 42
E
R
R R
C
R R
R
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Chapter 3 ‐ ZigBee Networks
E
E
E
20
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