Digi XBee S2C Zigbee User Manual page 106

Transmission, addressing, and routing
route record transmission is unicast along the many-to-one route until it reaches the data collector. As
the route record traverses the many-to-one route, it appends the 16-bit address of each device in the
route into the RF payload. When the route record reaches the data collector, it contains the address of
the sender, and the 16-bit address of each hop in the route. The data collector can store the routing
information and retrieve it later to send a source routed packet to the remote as shown in the
following images.
The data collector sends a many-to-one route request broadcast to create reverse routes on all
devices.
A remote device sends an RF data packet to the data collector. This is prefaced by a route record
transmission to the data collector.
XBee/XBee-PRO® S2C Zigbee® RF Module User Guide
RF packet routing
106