Patent ID: 7275978

Claim:
A hand power tool assembly, comprising: a hand power tool selected from various types of hand power tools; a power supply unit providing operating voltage for said hand power tool; a multi-wire cable connecting said hand power tool with said power supply unit and having a plurality of lines for delivering an operating voltage; an electronic control unit operative for adjusting parameters of said power supply unit to one or more operating parameters adapted to the selected type of said hand power tool connected with said power supply unit; and means which, when said hand power tool is switched on, transmit information from said hand power tool to said electronic control unit about said operating parameter or operating parameters to be adapted to the hand power tool, wherein said multi-wire cable includes at least one coding line, wherein said at least one coding line, when said hand power tool is switched on, serves to transmit information via a signal that is characteristic of the selected hand power tool from said hand power tool to said electronic control unit about said operating parameter or operating parameters to be adapted to the selected hand power tool, wherein said multi-wire cable further includes at least one control line, and further comprising a switch provided in said hand power tool to switch said hand power tool on and off, wherein when the switch is closed, the operating voltage is delivered from said power supply to said hand power tool and said switch feeds a pulse to said at least one coding line which is connected to said switch.