11-01-2020, 01:06 AM
OK, i see. There are two way to read the relay state.
1: Send read relay state to KC868 relay controller by "TCP OUT" node. Then will return the state string, you can use "TCP IN" node analysis relay is ON/OFF, then make an LED ON/OFF in Node-Red.
2: Way-1 is use software query mode, if you want physically read relay state, that need put wire from relay output back to your office, that need 100 meter line, I think it's hard to do it.
1: Send read relay state to KC868 relay controller by "TCP OUT" node. Then will return the state string, you can use "TCP IN" node analysis relay is ON/OFF, then make an LED ON/OFF in Node-Red.
2: Way-1 is use software query mode, if you want physically read relay state, that need put wire from relay output back to your office, that need 100 meter line, I think it's hard to do it.