User's Manual

XBee®/XBee‐PRO®ZBRFModules
©2009DigiInternational,Inc. 42
PAN ID Filtering
The XBee can be configured with a fixed PAN ID by setting the ID command to a non-zero value. If
the PAN ID is set to a non-zero value, the XBee will only join a network with the same PAN ID.
Preconfigured Security Keys
Similar to PAN ID filtering, this method requires a known security key be installed on a router to
ensure it will join a ZigBee network with the same security key. If the security key (KY command)
is set to a non-zero value, and if security is enabled (EE command), an XBee router or end device
will only join a network with the same security key.
Permit Joining
The Permit Joining parameter can be disabled in a network to prevent unwanted devices from
joining. When a new device must be added to a network, permit-joining can be enabled for a short
time on the desired network. In the XBee firmware, joining is disabled by setting the NJ command
to a value less than 0xFF on all routers and coordinator devices. Joining can be enabled for a short
time using the commissioning push-button (see Network Commissioning chapter for details) or the
CB command.
Application Messaging
If the above mechanisms are not feasible, the application could build in a messaging framework
between the coordinator and devices that join its network. For example, the application code in
joining devices could send a transmission to the coordinator after joining a network, and wait to
receive a defined reply message. If the application does not receive the expected response
message after joining, the application could force the XBee to leave and continue scanning (see
NR parameter).