Send KNX commands to control AHU Controller over MODBUS RTU

[Daniel]

Before we do anything first use Read test in LM to see if we starting to count from 1 or 0. Try Air!Temperature!Set!Point and read the value, you may need to subtract 1 from register.
Why do you have input and holding register for the same value? Do you want to read from one and write to another or can we read and write just to holding? Check what the manual says.