Patent ID: 8723715

Claim:
A system comprising: a server device for recording of switch signals, and an input panel that comprises several input zone, in which at least one client circuit is assigned to each input zone, wherein each client circuit of the at least one client circuit provide for transmission of their respective switch signals, wherein the client circuits are operable to detect a switch operation on the basis of a field-electric reciprocation effect through modulation of a quasistatic alternating field by a user, wherein the client circuits are coupled with the server device such that the server device provides the client circuits wirelessly with energy by an alternating signal having a carrier frequency and the client circuits communicate a client identification and a sensor data to the server device by modulating a load to the alternating signal, wherein the quasistatic alternating field for detecting said switch operation is provided by the alternating signal of the server device, and wherein the server device is equipped with an electrode which allows the generation of a field with extension which encompasses an associated area of the input panel with respect to the formation of the input zone.