Digi International Inc XBEEPRO2 Manuel D’Utilisation

These behaviors are configurable using the following commands:

The permit joining attribute on the router is configurable with the NJ command. NJ can be configured to always 
allow joining, or to allow joining for a short time.

If NJ=0xFF (default), joining is permanently enabled. This mode should be used carefully. Once a network has 
been deployed, the application should strongly consider disabling joining to prevent unwanted joins from 
occurring.

If NJ < 0xFF, joining will be enabled only for a number of seconds, based on the NJ parameter. The timer is 
started once the XBee joins a network. Joining will not be re-enabled if the module is power cycled or reset. The 
following mechanisms can 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 (enables joining for 1 minute)
•Issuing the CB command with a parameter of 2 (software emulation of a 2 button press - enables joining 

for 1 minute)
•Causing the router to leave and rejoin the network.

Once a router joins a ZigBee network, it remains connected to the network on the same channel and PAN ID as 
long as it is not forced to leave. (See Leaving a Network section for details.) If the scan channels (SC), PAN ID 
(ID) and security settings (EE, KY) do not change after a power cycle, the router will remain connected to the 
network after a power cycle.

If a router may physically move out of range of the network it initially joined, the application should include 
provisions to detect if the router can still communicate with the original network. If communication with the 
original network is lost, the application may choose to force the router to leave the network (see Leaving a 
Network section for details). The XBee firmware includes two provisions to automatically detect the presence of 
a network, and leave if the check fails.

The JV command (join verification) enables the power-on join verification check. If enabled, the XBee will 
attempt to discover the 64-bit address of the coordinator when it first joins a network. Once it has joined, it 
will 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).

NJ

Sets the permit-join time on 

the router, or the time that it 

will allow new devices to join 

the network, measured in 

seconds. If NJ=0xFF, permit 

joining will always be enabled.

D5

Enables the Associate LED 

functionality.

LT

Sets the Associate LED blink 

time when joined. Default is 2 

blinks per second (router).