The RS485-Quick Module is provided as an upgrade kit or included in the scope of delivery of the inverter.The RS485-Quick Module is only suitable for use with SMA inverter of type Sunny Boy 2000HF/2500HF/3000HF. Please also observe the installation guide of the respective inverter.The RS485-Quick Module is equipped with an RS485 interface and a multi-function relay. Via the RS485 interface, you can establish a wired RS485 communication of the above mentioned SMA inverter types.