- The power LED (ON) is on (green) if the module is running properly;
- The communication LED (TX) is on (orange) for 20 ms after sending each message. If the module receives/sends a lot of messages, the LED can be lit continuously;
- LEDs indicating the status of special inputs (S1-S2) are lit (green) if resistance connected to the input is less than 1 kΩ (dry contact input is active);
The LED also lights up if voltage connected to the input has a very low potential.
- LEDs indicating the status of digital outputs (O1-O2) are lit (orange) if the output is enabled.