API frame format
XLR PRO Radio Frequency (RF) Modem User Guide
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Transmitting and receiving RF data
The following image shows the API exchanges that take place at the serial interface 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
TX 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 serial interface when sending a remote AT
command. A remote command response frame is not sent out the serial interface if the remote device does not
receive the remote command.