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•
Event notifications such as reset, associate, disassociate, and so forth
The API provides alternative means of configuring modules and routing data at the host application
layer. A host application can send data frames to the module that contain address and payload
information instead of using command mode to modify addresses. The module will send data frames
to the application containing status packets; as well as source, and payload information from
received data packets.
The API operation option facilitates many operations such as the examples cited below:
•
Transmitting data to multiple destinations without entering Command Mode
•
Receive success/failure status of each transmitted RF packet
•
Identify the source address of each received packet
RF modules that contain the following firmware versions will support API operation: 1.1xx
(coordinator) and 1.3xx (router/end device).
Modes of operation
Idle Mode
When not receiving or transmitting data, the RF module is in Idle Mode. During Idle Mode, the RF
module is also checking for valid RF data. The module shifts into the other modes of operation under
the following conditions:
•
Transmit Mode (Serial data in the serial receive buffer is ready to be packetized)
•
Receive Mode (Valid RF data is received through the antenna)
•
Sleep Mode (End Devices only)
•
Command Mode (Command Mode Sequence is issued)
Transmit Mode
When serial data is received and is ready for packetization, the RF module will exit Idle Mode and
attempt to transmit the data. The destination address determines which node(s) will receive the data.
Prior to transmitting the data, the module ensures that a 16-bit network address and route to the
destination node have been established.
If the destination 16-bit network address is not known, network address discovery will take place. If a
route is not known, route discovery will take place for the purpose of establishing a route to the
destination node. If a module with a matching network address is not discovered, the packet is
discarded. The data will be transmitted once a route is established. If route discovery fails to
establish a route, the packet will be discarded.
XBee ZNet 2.5 / XBee PRO Znet 2.5 OEM RF Modules Product Manual
Modes of operation
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