Abstract: An electronic lock cylinder comprises a housing (1) with a cylinder core (9) disposed rotatably therein and lockable by a key (15) via mechanical tumblers (21). Electronic control circuits (45, 47) capable of being coupled inductively via coupling coils (43, 49) for the transmission of coding information, are associated with the lock cylinder and the key (15). The coupling coil (43) of the lock cylinder, and the electronic components included in the lock cylinder and a mounting (51), are combined into a structural unit which is removably attached to a front face of the lock cylinder. This permits separate assembly of the mechanical components and of the electronic components of the lock cylinder.

Abstract: A lock cylinder comprises a profile housing (1) with a cylinder core (9) disposed rotatably therein, and tumblers (15) which are controllable by a flat key. Disposed on the profile housing (1) is an information detector (37) which responds contactless to control information signals of a control circuit of the flat key, which is connected to an electronic control and power-supply circuit having at least some of its circuit components disposed separate from the lock cylinder. These circuit components are connected by a cable (43) and a plug connector (45) consisting of two plug parts (49, 51) complementary to one another. A first plug part (49) is mounted fixed on the profile housing (1), and the cable (43) bears a second, loose plug part (51) capable of placement on the first plug part (49).