Patent ID: 7667571

Claim:
A method for operating a keyless operating system for locking an enclosure, the method comprising the steps of: providing the enclosure with a first control device capable of receiving electromagnetic signals with frequencies ν lying in a frequency band between two cut-off frequencies νa, νb; providing a second device remote from the first control device; performing an initialization process comprising: searching and/or determining one frequency νi within the frequency band, on which the second device transmits an electromagnetic signal to the first control device; receiving the electromagnetic signal transmitted from the second device in the first control device; and storing the one frequency νi for the second device within storage means in the first control device after the electromagnetic signal transmitted at frequency νi is received from the second device; whereby after completion of the initialization process, when a device attached to the enclosure is activated, the first device transmits a wake up signal to the second device, the wake up signal causes the second device to change from a rest state to an activated state, and after the wake up signal, the first device transmits a range delimitation signal to the second device to determine the location of the second device, and the second device transmits a response signal containing location information and transmits the electromagnetic signal at the frequency νi to the first device, wherein the keyless system only uses the frequency νi within the frequency band to authenticate the second device.