Discover Zigbee networks

End devices go through the same process as routers to discover networks by issuing a PAN scan. After sending the broadcast beacon request transmission, the end device listens for a short time in order to receive beacons sent by nearby routers and coordinators on the same channel. The end device evaluates each beacon received on the channel to determine if it finds a valid PAN. A PAN is valid if any of the following exist:

• Has a valid 64-bit PAN ID (PAN ID matches ID if ID > 0)
• Has the correct stack profile (ZS command)
• Allows joining the network
• Has capacity for additional end devices

If the end device does not find a valid PAN, it performs the PAN scan on the next channel in its scan channels list and continues this process until it finds a valid network, or until all channels have been scanned. If the end device scan all channels and does not discover a valid PAN, it may enter a low power sleep state and scan again later.

If scanning all SC channels fails to discover a valid PAN, XBee Zigbee devices attempt to enter a low power state and retries scanning all SC channels after the device wakes from sleeping. If the device cannot enter a low power state, it retries scanning all channels, similar to the router. To meet Zigbee Alliance requirements, the end device attempts up to nine scans per minute for the first five minutes, and three scans per minute thereafter.

Note The XBee Zigbee end device will not enter sleep until it has completed scanning all SC channels for a valid network.