API operation API UART exchanges
XBee/XBee-PRO ZigBee RF Modules User Guide 113
Transmitting and receiving RF data
The following image shows the API exchanges that take place at the UART when sending RF data to another
device. 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 (0x90 or 0x91) is set by the AP command.
Remote AT commands
The following image shows the API frame exchanges that take place at the UART when sending a remote AT
command. A remote command response frame is not sent out the UART if the remote device does not receive the
remote command.
Source routing
The following image shows the API frame exchanges that take place at the UART when sending a source routed
transmission.
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