ZigBee networks ZigBee coordinator operation
XBee/XBee-PRO® S2C ZigBee® RF Module
60
Command Description
NJ
Sets the permit-join time on the coordinator, measured in seconds.
D5
Enables the Associate LED functionality.
LT Sets the Associate LED blink time when joined. If LT = 0, the default is 1 blink per 500
ms (coordinator) 250 ms (router/end device).
If any of the command values in the network formation commands table changes, the coordinator
leaves its current network and starts a new network, possibly on a different channel.
Note Command changes must be applied (AC or CN command) before taking effect.
Permit joining
You can use NJ (Node Join Time) to configure the permit joining attribute on the coordinator. You can
configure NJ to always allow joining, or to allow joining for a short time.
Joining always enabled
If NJ = 0xFF (default), joining is permanently enabled.
Use this mode carefully. Once a network has been deployed, we strongly recommend
that the application consider disabling joining to prevent unwanted joins from occurring.
Joining temporarily enabled
Set NJ < 0xFF, to enable joining for only a number of seconds, based on the NJ parameter. Once the
XBee/XBee-PRO ZigBee RF Module joins a network, the timer starts. The coordinator does not re-
enable joining if the device is power cycled or reset. The following actions restart the permit-joining
timer:
n Changing NJ to a different value (and applying changes with the AC or CN commands).
n Pressing the Commissioning button twice.
n Issuing the CB command with a parameter of 2.
The last two actions enable joining for one minute if NJ is 0x0 or 0xFF. Otherwise, the Commissioning
button and the CB2 command enable joining for NJ seconds.
Reset the coordinator
When you reset or power cycle the coordinator, it checks its PAN ID, operating channel and stack
profile against the network configuration settings (ID, CH, ZS). It also verifies the saved security policy
against the security configuration settings (EE, NK, KY). If the coordinator's PAN ID, operating channel,
stack profile, or security policy is not valid based on its network and security configuration settings,
the coordinator leaves the network and attempts to form a new network based on its network
formation command values.
To prevent the coordinator from leaving an existing network, issue the WR command after all network
formation commands have been configured in order to retain these settings through power cycle or
reset events.
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