An elevator system includes a lift cage, which is provided with a belt having markings disposed along the length thereof. A device for detecting at least the position, optionally, also the speed and the acceleration of the elevator cage, which is used to scan the markings, comprises a detector which is secured to the elevator cage and is displaced therewith. The detector is, preferably, arranged in such a manner that it detects the markings in one section of the belt which extend from the underloop of the carrier rollers on the elevator cage directly to a fixed point of the belt.