Transmission, addressing, and routing RF packet routing
XBee/XBee-PRO® S2C ZigBee® RF Module
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After obtaining a source route, the data collector sends a source routed transmission to the remote
device.
Acquiring source routes
Acquiring source routes requires the remote devices to send a unicast to a data collector (device that
sends many-to-one route request broadcasts). There are several ways to force remotes to send route
record transmissions.
1. If the application on remote devices periodically sends data to the data collector, each
transmission force a route record to occur.
2. The data collector can issue a network discovery command (ND command) to force all XBee
modules to send a network discovery response. A route record prefaces each network
discovery response.
3. You can enable periodic I/O sampling on remotes to force them to send data at a regular rate.
A route record prefaces each I/O sample. For more information, see Analog and digital I/O
lines.
4. If the NI string of the remote device is known, the DN command can be issued with the NI
string of the remote in the payload. The remote device with a matching NI string would send a
route record and a DN response.
Storing source routes
When a data collector receives a route record, it sends it out the serial port as a Route Record
Indicator - 0xA1. To use source routing, the application receives these frames and stores the source
route information.
Sending a source routed transmission
To send a source routed transmission, the application must send a Create Source Route - 0x21 to the
XBee/XBee-PRO ZigBee RF Module to create a source route in its internal source route table. After
sending the Create Source Route API frame, the application can send data transmission or remote
command request frames as needed to the same destination, or any destination in the source route.
Once data must be sent to a new destination (a destination not included in the last source route), the
application must first send a new Create Source Route - 0x21.
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