XBee ZigBee networks Router operation
XBee/XBee-PRO ZigBee RF Modules User Guide 43
Authentication
In a network where security is enabled, the router must then go through an authentication process. See ZB
security on page 74 for a discussion on security and authentication.
After the router is joined (and authenticated, in a secure network), it can allow new devices to join the network.
Persistent data
Once a router has joined a network, it retains the following information through power cycle or reset events:
PAN ID
Operating channel
Security policy and frame counter values
Child table (end device children that are joined to the coordinator).
The router will retain this information indefinitely until it leaves the network. When the router leaves a network,
the previous PAN ID, operating channel, and child table data are lost.
XBee ZB router joining
When the router is powered on, if it is not already joined to a valid ZigBee network, it immediately attempts to
find and join a valid ZigBee network.
Note The DJ command can be set to 1 to disable joining. The DJ parameter cannot be written with WR, so a
power cycle always clears the DJ setting.
The following commands control the router joining process.
Once the router joins a network, the network configuration settings and child table data persist through power
cycles as mentioned in Persistent data on page 43. If joining fails, the status of the last join attempt can be read in
the AI command register.
If any of the above command values change, when command register changes are applied (AC or CN commands),
the router will leave its current network and attempt to discover and join a new valid network.
When a ZB router has successfully joined a network, it:
Allows other devices to join the network for a time
Command Description
ID
Sets the 64-bit PAN ID to join. Setting ID=0 allows the router to join any 64-bit PAN ID.
SC
Set the scan channels bitmask that determines which channels a router will scan to find a valid network. SC on
the router should be set to match SC on the coordinator. For example, setting SC to 0x281 enables scanning on
channels 0x0B, 0x12, and 0x14, in that order.
SD
Set the scan duration, or time that the router will listen for beacons on each channel.
ZS
Set the stack profile on the device.
EE
Enable or disable security in the network. This must be set to match the EE value (security policy) of the
coordinator.
KY
Set the trust center link key. If set to 0 (default), the link key is expected to be obtained (unencrypted) during
joining.
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