ELECTRONIC DEVICE FOR THE OPERATION OF UTILITIES SUCH AS BURGLAR-ALARM UNITS, DOOR-OPENERS, SWITCHES AND SO ON

摘要

The device comprises a transmitter (T) and a receiver (R). The transmitter (T) comprises one non-rewritable memory (ID) for storing a fixed indentification code, a rewritable memory (D) for storing a variable transmission code and a microprocessor (M1) with a preset algorithm for the formation and emission of a string of data containing said codes. The receiver (R) comprises at least one memory (ID1-IDn) for storing at least one fixed identification code, at least one rewritable memory (D1-Dn) for storing at least one variable transmission code coincident with a previous variable transmission code received from the receiver and a microprocessor (M2) with a preset algorithm for comparing the string of data received with said identification code and said variable transmission code stored in said memories (ID1-IDn; D1-Dn) of the receiver. Both memories (ID, D) of the transmitter (T) are included together with the corresponding microprocessor (M1) inside a single sealed container (C1) suitable for preventing access to the algorithm of said microprocessor (M1) and to the content of said memories (ID, D).