Digi XBee 3 ZigBee User Manual page 110

Transmission, addressing, and routing
Note If a Create Source Route API frame does not precede the data frames, you may encounter data
loss.
The XBee 3 Zigbee RF Module can buffer one source route that includes up to 11 hops (excluding
source and destination). For example, suppose a network exists with a coordinator and 5 routers (R1,
R2, R3, R4, R5) with known source routes as shown in the following image.
To send a source-routed packet to R3, the application sends a Create Source Route API frame (0x21)
to the XBee, with a destination of R3, and 2 hops (R1 and R2). If the 64- bit address of R3 is
0x0013A200 404a1234 and the 16-bit addresses of R1, R2, and R3 are:
Device
R1
R2
R3
The Create Source Route API frame would be:
7E 0012 21 00 0013A200 404A1234 EEFF 00 02 CCDD AABB 5C
Field composition
0x0012
0x21
0x00
0x0013A200 404A1234
Digi XBee® 3 Zigbee® RF Module
16-bit address
0xAABB
0xCCDD
0xEEFF
length
API ID (create source route)
frame ID (set to 0 always)
64-bit address of R3 (destination)
RF packet routing
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