Abstract: A system and method for controlling functions of a vehicle includes first and second electromagnetic communication devices. The first electromagnetic communication device is adapted to transmit a coded response signal. The second electromagnetic communication device is adapted to receive the coded response signal. The second electromagnetic communication device is further adapted to transmit an uncoded outgoing signal and to receive an uncoded incoming signal that is a reflection of the outgoing signal.

Abstract: A device for detecting a key inserted into a motor vehicle lock includes a transmitter and a receiver connected to a micro-processor and a circuit connected directly between the transmitter and receiver and bypassing the microprocessor. When the key is inserted in the lock, the key communicates over a communications link with a lock-end interrogation device emitting intermittent interrogation pulses. The receiver activates the circuit upon receiving an interrogation pulse and actuates the transmitter to transmit a response pulse in response to the interrogation pulse. A key has a system for detecting whether it is inserted in a motor vehicle lock and includes a microprocessor, and a circuit connected directly between a transmitter and a receiver for sensing externally fed-in signals and bypassing the microprocessor.

Abstract: An energy coil together with an IR receiver form a mechatronic component of an ignition lock. The component is disposed in a receptacle of the ignition lock such that, with the ignition key inserted the component, it is disposed in close proximity to an energy coil and an IR transmitter of the ignition key and it is aligned with the latter.

Abstract: A medical system with adjustable, movable components that can be set by disengageable brakes, in particular an X-ray diagnostic apparatus with a C-arm that can be adjusted in the height of its orbital position and angulation and that carries an X-ray source and a beam receiver at its ends, has a sterilizeable handle that can be plugged in various positions, with a plug lock. A disengage button for the system brakes is arranged on the handle, which can be engaged with switching apparatuses in the system upon plugging the handle into a component of the system. The button can then be operated for actuating and disengaging the brakes.