A first target wheel has an opening and rotates about an axis of rotation to move the opening along a generally circular path. The operable ramp has a ramp panel rotatable about a first axis located at a first end. The signal lines to be used are set for each external device using configuration pins or similar means. A surface hardening treatment is also applied to an outer surface of each cylindrical member 8 by a heat treatment, thereby forming a hard layer Hb thereon. In a device information management system in which a management server for managing device information and various devices are connected, a request to transmit the device information to the management server is transmitted to another device and the device information of the requesting device is transmitted to the management server in accordance with the request.