Pushbutton purmutation code control means for a security alarm s

Details Pushbutton purmutation code control means for a security alarm s Pushbutton purmutation code control means for a security alarm s

1975-10-15

1977-05-03

Swann III, Glen R.

Communications: electrical

Systems

Call station

340408, 340409, 340164R, 361172, G08B 1308, G08B 2900

Patent

active

040217965

ABSTRACT:
An activation and deactivation circuit is provided for a security alarm system and includes selector means for selecting a predetermined coded number for enabling and disabling the alarm system. A coded circuit is responsive to the predetermined code from the selector to produce a control signal for enabling the alarm circuit when disabled and disabling the alarm circuit when enabled. Should an error in the predetermined coded number be detected, it is registered in a memory circuit and a second error will activate the alarm, thereby indicating tampering by unauthorized personnel.

REFERENCES:
patent: 3441808 (1969-04-01), Crane
patent: 3529292 (1970-09-01), Neill et al.
patent: 3544987 (1970-12-01), McMann, Jr. et al.
patent: 3633167 (1972-01-01), Hedin
patent: 3648268 (1972-03-01), Paull
patent: 3659154 (1972-04-01), Finn
patent: 3778770 (1973-12-01), Hagendoorn et al.
patent: 3833895 (1974-09-01), Fecteau
patent: 3839710 (1974-10-01), Rogers
patent: 3881171 (1975-04-01), Moorman et al.
patent: 3953769 (1976-04-01), Sopko

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