Transmitter-receiver system with (re-)initialization

A transmitter-receiver system for checking authorization to use an object;

• comprising:
• a transmitter having a transmitting element and a first transmitter operator control element which triggers the transmitting of coded signals by the transmitting element, the coded signal representing a code concerning the authorization to use the object, and
• the transmitter also having at least one transmitter memory for storage of data regarding the coded signals representing the coded concerning the authorization to use;
• a receiver, having a receiving element which receives the coded signals from the transmitter, having a receiver memory for storage of data for determining authorization or non-authorization of the codes received in the coded signals, and having
• a logic unit, which checks the received code with the data stored in the receiver memory and, depending on the result of the check, actuates a mechanism on the object;
• in (re-)initialization of the system for at least one of matching and rematching a new code transmitted by the transmitter to a code authorized by the receiver, the transmitter having for preparation of the new code a random generator, which generates a random number by actuation of a second transmitter operator control element;
• an original code, which establishes one of a starting code and a set of various new codes including the starting code using at least one of the transmitted original code, data formed in the receiver from the original code, and data formed in the transmitter from the original code, the original code being stored in the transmitter memory or in the receiver memory, wherein the random generator generates a random number that is indicative of only a fragment of the original code and, by further actuations of the second operator control element, produces in stages all fragments of the original code,
• the transmitter having a logic unit for converting the generated fragments into the original code,
• the original code or starting code being established from at least three fragments derived from random numbers generated by the random generator, and
• the original code being transmitted unidirectionally from the transmitter to the receiver without any dialogue taking place automatically and bidirectionally between the transmitter and the receiver.