AT commands Networking commands
Digi XBee® 3 Zigbee® RF Module
179
Zigbee 3.0 does not allow the network to be always open for joining; modules that attempt to join
when the join window is closed will report an AI value of 0x23. The join window can optionally be
persistently opened by setting NJ = 0xFF, but this causes the device to operate outside of the Zigbee
3.0 specifications.
The join window opens under the following conditions:
n NJ parameter value is changed and applied.
n Local device is power cycled.
n Local device forms a network (CE=1).
n Commissioning button is enabled (D0=1) and is physically pressed twice.
n A CB2 AT command is issued.
If you set NJ to 0, the join window will always be closed; this is the recommended setting for secure
networks. When configured with this setting, using a CB2 AT command or pressing the commissioning
button twice opens the join window for one minute.
On end devices, NJ also enables or disables rejoining attempts. For an end device to enable rejoining,
set NJ less than 0xFF on the device that joins. If NJ < 0xFF, the device assumes the network is not
allowing joining and first tries to join a network using rejoining. If multiple rejoining attempts fail, or if
NJ = 0xFF, the device attempts to join using association.
Note When a device is rejoining a network, the join window does not need to be open. However, if the
rejoin attempt fails six times, the module attempts to join by association which requires an open
joining window.
Parameter range
0 - 0xFF (seconds)
Default
0xFE (254 seconds)
DJ (Disable Joining)
Prevent a local device from joining a network.
This does parameter does not affect end devices that are already joined to a network. It only prevents
those devices from joining another network.
Note This parameter is not written to flash with the WR command and reverts to default after a
power cycle.
Parameter range
0 - 1
Value Description
0 Enable Joining
1 Disable Joining
Default
1
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