The IO modules have LEDs that display the device status:
flashes, red! This LED displays the fact that the module runs under 19 V supply voltage. It does not display a fault.
| LED | Signal | Meaning |
| Power | on, green | RevPi Core is connected to the power supply. |
| flashes, red | Connection to RevPi Core is not yet set up (initialization phase). | |
| on, red | Connection to RevPi Core is interrupted. Check if PiBridge is plugged properly. | |
| OUT | off | Connection to RevPi Core is not yet set up (initialization phase). |
| on, green | Outputs are ready for use. | |
| flashes, red | Outputs are defective. Check the connection to the power supply. | |
| on, red | No or low power supply. Check if your device is supplied by the permitted voltage range (10.7 V – 28.8 V). | |
| IN | on, green | Inputs are ready for use. |
| off | Connection to RevPi Core is not yet set up (initialization phase). | |
| on, red | No power supply to the inputs on the plug X2. Check the connection to the power supply. |