The BACnet MS/TP module in an IP65 housing with 4 digital inputs was developed for decentralized switching tasks. It is suitable for detecting potential-free switch states, e.g. electrical limit switches on ventilation flaps or auxiliary contacts on power contactors. The inputs can be connected using potential-free switches or contacts or as voltage inputs. The inputs can be queried using standard objects via a BACnet client. The module address and bit rate are set using two switches.