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 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:

• Changing NJ to a different value (and applying changes with the AC or CN commands).
• Pressing the Commissioning button twice.
• 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.

Joining always enabled

If NJ = 0xFF, 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. An always-open network operates outside of the Zigbee 3.0 specifications.