© 2014 Digi International Inc. 41
XBee/XBee-PRO
®
DigiMesh 2.4 User Manual
XBee/XBee-PRO
DigiMesh 2.4 Networking
Mesh networking allows messages to be routed through several different nodes to a final
destination. DigiMesh firmware allows manufacturers and system integrators to bolster their
networks with the self-healing attributes of mesh networking. In the event that one RF
connection between nodes is lost (due to power-loss, environmental obstructions, etc.) critical
data can still reach its destination due to the mesh networking capabilities embedded inside the
modules.
DigiMesh Feature Set
DigiMesh contains the following features:
• Self-healing: Any node may enter or leave the network at any time without causing the
network as a whole to fail.
• Peer-to-peer architecture: No hierarchy and no parent-child relationships are needed.
• Quiet Protocol: Routing overhead will be reduced by using a reactive protocol similar to
AODV.
• Route Discovery: Rather than maintaining a network map, routes will be discovered and
created only when needed.
• Selective acknowledgements: Only the destination node will reply to route requests.
• Reliable delivery: The use of acknowledgements ensures reliable data delivery.
• Sleep Modes: Low power sleep modes with synchronized wake are supported with variable
sleep and wake times.
DigiMesh Networking Concepts
Device Configuration
DigiMesh modules can be configured to act as routers or end devices with the CE command. By
default all modules in a DigiMesh network act as routers. Modules configured as routers actively
relay network unicast and broadcast traffic as described below.
Network ID
DigiMesh networks are defined with a unique network identifier. This identifier is set with the ID
command. For modules to communicate, they must be configured with the same network
identifier. The ID parameter allows multiple DigiMesh networks to co-exist on the same physical
channel.
Operating Channel
DigiMesh modules utilize direct-sequence spread spectrum modulation and operate on a fixed
channel. There are 16 operating channels defined in the 2.4 GHz frequency band. XBee modules
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