4.2 Bluetooth Status LED (PB5)

The Bluetooth status LED (PB5) indicates the Bluetooth Low Energy connection status by specific LED Flash pattern. See the following pattern description.
  • Standby mode – No Bluetooth Low Energy connection. The RNBD451 module is in Advertisement or Scan state. Flash one time every three seconds. (ON: 50 ms, OFF: 2950 ms)
  • Linked Mode – Bluetooth Low Energy ACL link is connected no matter central or peripheral role. Flash two times every 1.5 seconds. (ON: 50 ms, OFF: 150 ms, ON: 50 ms, OFF: 1050 ms)
  • MCU DFU Mode – The RNBD451 module is in the MCU DFU procedure. Flash four times every 2 seconds (ON: 100 ms, OFF: 100 for each time)
Note: By default, the Bluetooth status LED is turned OFF. The user can enable this feature by using the SR command. For more details on the SR command, refer to 5.2.15 Set Application Options (SR,<hex16>).