Electronic remote control means, especially for centrally contro

Details Electronic remote control means, especially for centrally contro Electronic remote control means, especially for centrally contro

1987-09-28

1989-07-11

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340825720, 340825310, H04Q 700, G08C 1900

Patent

active

048476145

ABSTRACT:
The electronic remote control means operates according to the known principle of code stepping through which a different code word is used after each transmitting/receiving operation. In accordance with the invention the respective new code word is produced anew by linking according to a given function, starting from a stored original code word and the previous code word. In case of non-agreement between the code word received and the new code word determined at the receiver additional code words are produced in sequence at the receiver. Thereafter, if no agreement results, the receiver switches over to an increased security mode wherein two successive code words in sequence must be successfully compared.

REFERENCES:
patent: 4509093 (1985-04-01), Stellberger
patent: 4723121 (1988-02-01), Van den Boom et al.

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