Computers for industrial control and automation systems



Pigeon RB700 Essence has seven LEDs (including four built-in Ethernet sockets). Three of them are visible through the front panel:

  • ACT (red) - led-act,
  • USR (yellow) - led-usr,
  • PWR (green) - power.

The PWR LED is under hardware control and indicates the presence of the correct supply voltage. The PWR LED is controlled by the circuit, which monitors the value of the supply voltage.

USR and ACT LEDs can be controlled by the user.

The default trigger for the ACT LED is 'heartbeat':

cat /sys/class/leds/led-act/trigger

none rc-feedback kbd-scrolllock kbd-numlock kbd-capslock kbd-kanalock kbd-shiftlock kbd-altgrlock kbd-ctrllock kbd-altlock kbd-shiftllock kbd-shiftrlock kbd-ctrlllock kbd-ctrlrlock timer oneshot [heartbeat] backlight gpio cpu cpu0 cpu1 cpu2 cpu3 default-on input panic actpwr mmc1 mmc0 rfkill-any rfkill-none

You can change trigger:

echo mmc0 >/sys/class/leds/led-act/trigger

or deactivate trigger:

echo none >/sys/class/leds/led-act/trigger

The LED can be turned on and off using the 'brightness' file:

echo 0 > /sys/class/leds/led-act/brightness # ACT LED turn off
echo 1 > /sys/class/leds/led-act/brightness # ACT LED turn on
echo 0 > /sys/class/leds/led-usr/brightness # USR LED turn off
echo 1 > /sys/class/leds/led-usr/brightness # USR LED turn on

LEDs built-in Ethernet sockets:

  • 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.


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