Pigeon RB350 has five LEDs (including two built-in Ethernet socket). Three of them are visible through the front panel:

  • PWR (green) - power status,
  • GSM (blue) - state of the mPCIe card,
  • USR (yellow) - GPIO0 - led0.

The GSM LED indicates the state of the mPCIe card. This LED is connected to LED_WWAN signal of the mPCIe connector.

The PWR LED (build in POWER button) is under hardware control and indicates the state of UPS (see tab. 1). The PWR LED is controlled by a microcontroller, which monitors the value of the supply voltage and UPS state.

Table 1. The PWR LED states

250 ms off, 250 ms on UPS charging Not running
Turned on Power on Running
250 ms off, 100 ms on Brownout detection Running
900 ms off, 100 ms on Shutdown in progress Running
Turned off Power off Not running

The USR LED can be controlled by the user:

gpio write 0 1 # USR LED turn off
gpio write 0 0 # USR LED turn on

LEDs built-in Ethernet socket:

  • green - LINK - LED is on when a valid link is detected. LED blinks when transmit or receive activity is detected.

  • yellow - SPEED - LED is on when the Ethernet operating speed is 100Mbs, or during auto-negotiation. LED is off during 10Mbs operation, or during line isolation.