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XBee Series 2 OEM RF Modules ‐ ZigBee ‐ v1.x2x [2007.07.019]
2.1.4. Transparent Operation
2.1.5. API Operation
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RF modules that contain the following firmware versions will support Transparent Mode:
1.0xx (coordinator) and 1.2xx (router/end device).
When operating in Transparent Mode, the modules act as a serial line replacement. All UART data
received through the DIN pin is queued up for RF transmission. When RF data is received, the data
is sent out the DOUT pin. The module configuration parameters are configured using the AT
command mode interface. (See RF Module Operation --> Command Mode.)
When RF data is received by a module, the data is sent out the DOUT pin.
Serial-to-RF Packetization
Data is buffered in the serial receive buffer until one of the following causes the data to be
packetized and transmitted:
1.
No serial characters are received for the amount of time determined by the RO (Packetiza-
tion Timeout) parameter. If RO = 0, packetization begins when a character is received.
2.
Maximum number of characters that will fit (72) in an RF packet is received.
3.
The Command Mode Sequence (GT + CC + GT) is received. Any character buffered in the
serial receive buffer before the sequence is transmitted.
API (Application Programming Interface) Operation is an alternative to the default Transparent
Operation. The frame-based API extends the level to which a host application can interact with the
networking capabilities of the module. RF modules that contain the following firmware versions will
support API operation: 1.1xx (coordinator) and 1.3xx (router/end device).
When in API mode, all data entering and leaving the module is contained in frames that define
operations or events within the module.
Transmit Data Frames (received through the DIN pin (pin 3)) include:
• RF Transmit Data Frame
• Command Frame (equivalent to AT commands)
Receive Data Frames (sent out the DOUT pin (pin 2)) include:
• RF-received data frame
• Command response
• Event notifications such as reset, associate, disassociate, etc.
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
To implement API operations, refer to the API Operation chapter 6.
© 2007 Digi International, Inc.
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Chapter 2 ‐ RF Module Operation
12
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