PROTECTION APPARATUS AND METHOD FOR ELECTRIC AND ELECTRONIC DEVICE

摘要

An apparatus and method have elements and steps selected and arranged to require a timed, coded input for authenticating a code of characters in a set sequence for authorizing user access and having means for emitting a signal or alarm, wherein the system is initialized so as to require matching of representative signals from a decoder (115) and a counter (125) at inhibiting control cicruits (118) having an on-state and an off-state so that characters entered sequentially in timed cycles are authenticated as a correct member of a code set in a correct time cycle or disqualified as an unauthentic character. An authentic character is a certain designated character entered in the selected time cycle.