Patent ID: 8255125

Claim:
A control panel adapted to be removed from a receptable of earth moving equipment to lock the earth moving equipment from being used, wherein the control panel is further configured to be fitted with the receptable to unlock the earth moving equipment such that the control panel is configured to control the earth moving equipment and to enable the visual presentation of information relating to the operation of the earth moving equipment, the control panel comprising a power supply and communication means for data wherein, when the control panel is fitted into a receptable in the earth moving equipment, operating power for the control panel is supplied by wireless means, while data signals are exchanged between the control panel and the receptable by contactless means, and wherein the contactless communication is a wireless two-way communication using inductive means for at least one direction of communication, wherein the wireless two-way communication occurs by modulating the power supply current in a transmitting coil in the receptable for one direction of communication and by modulating the load impedance of a receiving coil in the control panel for the opposite direction of communication.