Xbee-Pro Digimesh - Libelium Waspmote Technical Manual

9.5. XBee-PRO DigiMesh

Radio version
XBee-PRO
DigiMesh
* To determine your range, perform a range test under your operating conditions
The XBee-PRO 802.15.4 modules can use an optional firmware called DigiMesh. So the modules can create mesh
networks instead of the usual point-to-point topology. This firmware has been developed by Digi in order to
allow the modules to sleep, synchronize themselves and work on equal terms, avoiding the use of node routers
or coordinators that have to be permanently powered on. Characteristics of the implemented protocol:
Self healing: any node can join or leave the network at any moment.
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All nodes are equal: there are no father-son relationships.
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Silent protocol: reduced routing heading due to using a reactive protocol similar to AODV (Ad hoc On-
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Demand Vector Routing).
Route discovery: instead of keeping a route map, routes are discovered when they are needed.
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Selective ACKs: only the recipient responds to route messages.
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Reliability: the use of ACKs ensures data transmission reliability.
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Sleep modes: low energy consumption modes with synchronization to wake at the same time.
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The classic topology of this type of network is mesh, as the nodes can establish point-to-point connections with
brother nodes through the use the MAC address doing multi-hop connections when it is necessary.
Figure: Mesh topology
The XBee DigiMesh modules share the hardware module with the XBee-PRO 802.15.4. So it is possible to change
the firmware of this kind of modules from one to another and vice versa (this can be done with a Gateway). For
this reason, the characteristics related to the hardware are the same.
The XBee DigiMesh modules are based on the standard IEEE 802.15.4 that supports functionalities enabling mesh
topology use.
Related API libraries: WaspXBeeCore.h, WaspXBeeCore.cpp, WaspXBeeDM.h, WaspXBeeDM.cpp
All information about their programming and operation can be found in the
All the documentation is located in the
Frequency Transmission power
2.4 GHz
Development section
Sensitivity
18 dBm -100 dBm
DigiMesh Networking
in the Libelium website.
-90-
802.15.4/ZigBee/RF modules
Range*
1500 m
Guide.
v8.2