Digi International Inc XBEEPRO2 Manual Do Utilizador

All ZigBee devices have two different addresses, a 64-bit and a 16-bit address. The characteristics of each are 
described below.

The 64-bit address is a unique device address assigned during manufacturing. This address is unique to each 
physical device. The 64-bit address includes a 3-byte Organizationally Unique Identifier (OUI) assigned by the 
IEEE. The 64-bit address is also called the extended address.

A device receives a 16-bit address when it joins a ZigBee network. For this reason, the 16-bit address is also 
called the "network address". The 16-bit address of 0x0000 is reserved for the coordinator. All other devices 
receive a randomly generated address from the router or coordinator device that allows the join. The 16-bit 
address can change under certain conditions:

•An address conflict is detected where two devices are found to have the same 16-bit address
•A device leaves the network and later joins (it can receive a different address)

All ZigBee transmissions are sent using the source and destination 16-bit addresses. The routing tables on 
ZigBee devices also use 16-bit addresses to determine how to route data packets through the network. 
However, since the 16-bit address is not static, it is not a reliable way to identify a device. 

To solve this problem, the 64-bit destination address is often included in data transmissions to guarantee data is 
delivered to the correct destination. The ZigBee stack can discover the 16-bit address, if unknown, before 
transmitting data to a remote.

ZigBee devices can support multiple application profiles, cluster IDs, and endpoints. (See "ZigBee Application 
Layers - In Depth" in chapter 3.) Application layer addressing allows data transmissions to be addressed to 
specific profile IDs, cluster IDs, and endpoints. Application layer addressing is useful if an application must

•Interoperate with other ZigBee devices outside of the Digi application profile
•Utilize service and network management capabilities of the ZDO
•Operate on a public application profile such as Home Controls or Smart Energy.

The API firmware provides a simple yet powerful interface that can easily send data to any profile ID, endpoint, 
and cluster ID combination on any device in a ZigBee network. 

ZigBee data packets can be sent as either unicast or broadcast transmissions. Unicast transmissions route data from 
one source device to one destination device, whereas broadcast transmissions are sent to many or all devices in the 
network.