As an interface between the KNX system and a heat or cold generator. The temperature setpoint or the setpoint adjustment can be transmitted to the heat/cold generator via an analog output (0.10 V). The setpoint itself is received via KNX. The device can monitor the status of the heat/cold generator via two binary signal inputs (via potential-free contacts) and send it to the KNX bus. The device has a relay output (5 A) with which the heat/cold generator can be switched on or off. The pump of the heat/cold generator can be switched on and off with an additional relay output (5 A). The status of the pump can be monitored via 3 binary signal inputs (via potential-free contacts) and this feedback can be included in the control of the pump. The ABB i-bus tool can be used for extended diagnostic functions and improved commissioning.