XBee® Wi-Fi RF Modules
© 2013 Digi International, Inc. 69
API UART and SPI Exchanges
AT Commands
The following image shows the API frame exchange that takes place at the UART or SPI
when sending an AT command request to read or set a module parameter. The
response can be disabled by setting the frame ID to 0 in the request.
Transmitting and Receiving RF Data
The following image shows the API exchanges that take place at the UART or SPI when
sending RF data to another module. The transmit status frame is always sent at the end
of a data transmission unless the frame ID is set to 0 in the transmit request. If the
packet cannot be delivered to the destination, the transmit status frame will indicate
the cause of failure. The received data frame (0x80 or 0xB0) is set by the AP command.
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