Stand-alone access control system clock control

Details Stand-alone access control system clock control Stand-alone access control system clock control

1984-05-22

1987-02-17

Krass, Errol A.

Boots, shoes, and leggings

34082531, 34030915, 328 63, 368200, 377 16, G04F 1050, H03K 117, G08B 100, G04B 1712

Patent

active

046444840

ABSTRACT:
A card reader located in proximity to the central point of the secured area having a crystal controlled time base clock. Entry is granted when the proper information is entered to the card reader through a keypad or identification card. The clock is adjusted under software control according to a selected offset signal. The card reader is operable to provide access control of a secured area according to a schedule operable relative to the card reader clock without external reference signals.

REFERENCES:
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patent: 4408897 (1983-10-01), Mutrux
patent: 4427302 (1984-01-01), Watanabe
patent: 4453834 (1984-06-01), Suzuki et al.
patent: 4502790 (1985-03-01), Yokoyama
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patent: 4537515 (1985-08-01), Dinger et al.
patent: 4538056 (1985-08-01), Young et al.
patent: 4564953 (1986-01-01), Werking
Karstad et al., "A Software-Controlled Real-Time Clock", New Electronics, vol. 12, No. 12, Jan. 12, 1979, pp. 26-32.

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