Pset_DataTransmissionUnit Properties common to a data transmission unit. This property set is applied to a type or occurrence of _IfcCommunicationsAppliance_ with predefined type MODEM. IfcCommunicationsAppliance/MODEM IfcCommunicationsAppliance/MODEM WorkingState Indicates the working state of device or system. SerialInterfaceType Indicates the type of serial interface used by the device. RS_232 RS_422 RS_485 OTHER NOTKNOWN UNSET RS_232 Standard TIA/EIA-232 interface. RS_422 Standard TIA/EIA-422 interface. RS_485 Standard TIA-485(-A) or EIA-485 interface. OTHER required category not on scale (other) Value is not listed. NOTKNOWN Value is unkown (unknown) Value is unknown. UNSET Value has not been specified (unset) Value has not been specified. DataTransmissionUnitUsage Indicates the usage of the data transmission unit. It can be used to transmit data for different types of sensors. EARTHQUAKE FOREIGNOBJECT WINDANDRAIN OTHER NOTKNOWN UNSET EARTHQUAKE Data transmission unit for earthquake sensor. FOREIGNOBJECT Data transmission unit for foreign object sensor. WINDANDRAIN Data transmission unit for wind and rain sensor. OTHER required category not on scale (other) Value is not listed. NOTKNOWN Value is unkown (unknown) Value is unknown. UNSET Value has not been specified (unset) Value has not been specified.