Digi International Inc XBEEPRO2 Manuel D’Utilisation

Page de 155
XBee®/XBee‐PRO® ZB RF Modules 
© 2011 Digi International, Inc.
     52
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).