Here, what should I put in my “Write Value Type”? I’ve tried many but the internal unit never turns the AC of that room “ON” and besides, the “Last Successful Write” and “Last Erroring Write” still have “null” on both.
I’ve created a basic rule to set the “Value as Number” to 1 each 10 seconds, so I could be changing settings and see if the internal unit would turn on at any time.
So, no luck so far… 
Wasn’t modbus suposed to be simple? I’ve just struggled so much with this, it’s crazy! And the amount of money burned already in “modbus” interfaces for the AC units, it’s also ridiculous, so there is no way back now, I need to put this working… somehow 