Microcomputer controlled combination lock security system
First Claim
1. A security system for restricting access to a secure area to authorized persons, comprising, in combination:
- (a) a microcomputer containing a first, selectively programmable read-only memory;
(b) a key device having mounted thereon a second, selectively programmable read-only memory;
(c) each of said first and second memories containing corresponding pluralities of corresponding, multi-digit, combination codes arranged in corresponding sequences;
(d) key reader means connected to said microcomputer and having a receptacle for receiving therein a portion of said key device to establish electrical connections between said key device and said microcomputer;
(e) means governed by said microcomputer for transferring data from said key device to said microcomputer;
(f) a controlled access device governing physical access to said secure area; and
(g) circuit means connecting said microcomputer and said access device, said microcomputer being effective to compare said multi-digit combination codes, one complete code at a time, and to compare said code sequences stored in said first and second memories and to control said circuit means to enable said access device when and only when such comparison shows equality of said multi-digit combination codes and their sequence.
1 Assignment
0 Petitions
Accused Products
Abstract
A security system includes a microcomputer with an auxiliary read-only memory and a key device including a similar read-only memory, each of the read-only memories containing corresponding pluralities of corresponding binary combination codes. Under the control of the microcomputer the codes are read and compared. If the combinations and the sequence do not compare, the system will not unlock and an alarm will be generated. The read-only memories are of the programmable type, so that changes in the combinations and sequences can be accomplished easily. A plurality of visual indicators and an audible alarm provide the user and personnel in the secure area with information concerning the status of the system.
46 Citations
6 Claims
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1. A security system for restricting access to a secure area to authorized persons, comprising, in combination:
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(a) a microcomputer containing a first, selectively programmable read-only memory; (b) a key device having mounted thereon a second, selectively programmable read-only memory; (c) each of said first and second memories containing corresponding pluralities of corresponding, multi-digit, combination codes arranged in corresponding sequences; (d) key reader means connected to said microcomputer and having a receptacle for receiving therein a portion of said key device to establish electrical connections between said key device and said microcomputer; (e) means governed by said microcomputer for transferring data from said key device to said microcomputer; (f) a controlled access device governing physical access to said secure area; and (g) circuit means connecting said microcomputer and said access device, said microcomputer being effective to compare said multi-digit combination codes, one complete code at a time, and to compare said code sequences stored in said first and second memories and to control said circuit means to enable said access device when and only when such comparison shows equality of said multi-digit combination codes and their sequence. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification