I'm trying to implement a modbus tcp comunication between two arduino.
Following the two examples on myarduinoprojects.com, when I connect two controllino and load the program to the slave and master, it prints on the serial this serial output, and a similar thing to the slave device.
Reading the code from the examples, I understood that if I send a number between 1 and 6 (but also 15 and 16) on the serial input, the program writes or reads different things from the slave. When I put on the serial input a number like 5, the ethernet port's LED blinks and I think that it means that some data pass between the controllino, but in the slave nothing happens.
How can I modify this program to send or receive boolean data (coils)? And if there are other libraries or programs that I can use, can someone tell me?
