HI,
I follow https://www.gammon.com.au/forum/?id=11428&reply=1#reply1 for RS485. I want to send message from master to slave at once.
Like
byte msg []={
1, //device 1
2 //turn LED ON
};
Note- The problem is master send message 2 at all time so that LED is getting ON but I want to OFF after LED is ON. Can anyone help me?