Interface device for a processing unit for connecting a plurality of circuits and acquiring their state value by means of a single input port

An interface device for a processing unit, allowing a plurality of circuits to be connected to a common input port of the processing unit that is configured to acquire a state value of a circuit of the plurality of circuits, the interface device comprising:

• a plurality of power sources, each power source being associated with a respective one of the plurality of circuits;
• and
• a switch configured to selectively connect the respective one of the plurality of power sources to a connection point, the connection point permanently connecting the common input port of the processing unit to a single circuit of the plurality of circuits, while connecting ground to remaining connection points, the remaining connection points permanently connecting the common input port of the processing unit to remaining circuits of the plurality of circuits, such that the state value of the single circuit is input to the common input port of the processing unit,
• wherein the switch is controlled by a set of at least one output port of the processing unit.