XBee ZigBee networks Router operation
XBee/XBee-PRO ZigBee RF Modules User Guide 45
also attempt to discover the 64-bit address of the coordinator after a power cycle event. If 3 discovery attempts
fail, the router will leave the network and try to join a new network. Power-on join verification is disabled by
default (JV defaults to 0).
Network watchdog
The NW command (network watchdog timeout) can be used for a powered router to periodically check for the
presence of a coordinator to verify network connectivity. The NW command specifies a timeout in minutes where
the router must receive communication from the coordinator or data collector. The following events restart the
network watchdog timer:
RF data received from the coordinator
RF data sent to the coordinator and an acknowledgment was received
Many-to-one route request was received (from any device)
Changing the value of NW.
If the watchdog timer expires (no valid data received for NW time), the router will attempt to discover the 64-bit
address of the coordinator. If the address cannot be discovered, the router records one watchdog timeout. Once
three consecutive network watchdog timeouts have expired (3 * NW) and the coordinator has not responded to
the address discovery attempts, the router will leave the network and attempt to join a new network. Anytime a
router receives valid data from the coordinator or data collector, it will clear the watchdog timeouts counter and
restart the watchdog timer. The watchdog timer (NW command) is settable to several days. The network
watchdog feature is disabled by default (NW defaults to 0).
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