Send KNX commands to control AHU Controller over MODBUS RTU

[Sumit]

can you please elaborate or mention the places where i need to add the register number & they'll take data points in MODBUS TCP & LM will be slave as you said.
  
  mb = luamodbus.tcp()

  mb:open('0.0.0.0', 502) - here do i need to mention LM IP in the script