H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
342/21, 342/11.1
H04Q 1/39 (2006.01) G07C 9/00 (2006.01)
Patent
CA 1276039
MICROCOMPUTER CONTROLLED DOOR LOCKING SYSTEM ABSTRACT A locking system is disclosed which comprises a microcomputer controlled lock with multiple level keying, i.e. multiple keys having different functions in the locking system A key reader, for example punch card or magnetic type, reads key code into the microcomputer. A read/write memory has a predetermined number of assigned key codes stored therein and a read-only memory has a control program stored therein for control of the microcomputer. An electrically controlled actuator for the locking means is coupled with an unlocking output of the microcomputer. The control program comprises a main program and a plurality of subroutines each stored at a different location in the read-only memory. A function table has a number of pointers each of which points to the memory address of one of the subroutines. The number of pointers in the function table is equal to the number of locations in the key code memory. Decoding means operative under program control in conjunction with a control code on the key points to selected locations in the key code memory and the function table corresponding to the control code. The microcomputer, under control of the main program, compares the primary and secondary key codes from the selected key with the assigned key code at the location in the key code memory. If there is a match, the microcomputer then operates under the control of the subroutine at the memory address pointed to by the function table to execute the function of the selected key.
592386
Fraser Stephen George
Computerized Security Systems Incorporated
Finlayson & Singlehurst
LandOfFree
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