R F - t o - U S B - R D
8
Rev. 0.1
Figure 8. RF to USB UART Demo Application During Communication
When the Sensor Node receives any UART data on the RX pin, it will wake from the low power mode and transmit
data immediately. The Sensor Node also polls the USB Dongle once per second. If there is any data waiting, the
Sensor Node will retrieve pending data.
The LED indications are similar to the Network Demo. The Sensor Node green LED will blinks when it transmits
data. The USB Dongle green LED will blink when it receives data. The Sensor Node red LED will blink if it does not
receive an acknowledgement from the USB Dongle. If the USB Dongle red LED illuminates continuously this
indicates are hardware fault.
Note:
The UART demo is a point-to-point RF demo. The UART demo does not support more than one Sensor Node.
If the UART communication is not working as expected, test the RF link using the loop-back mode first. Most
problems occur due to incorrect baud rate settings. Use an oscilloscope to check the bit time in both directions.
The UART demo Sensor Node will stop polling after 8 hours of inactivity. This will conserve battery power if the
UART is not used. Press the button to wake up the UART demo after 8 hours. Remove the battery from the Sensor
Node to stop the UART demo.
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