Method and apparatus for controlling a machine

Details Method and apparatus for controlling a machine Method and apparatus for controlling a machine

1989-01-03

1991-09-24

Levy, Stuart S.

Registers

Systems controlled by data bearing records

Credit or identification card systems

235382, 36446402, G06F 706, G03G 1500

Patent

active

050515640

ABSTRACT:
A machine control and accounting arrangement for controlling operation of a machine includes a secure housing, an electronic control system within the housing, and first and second interfaces coupled to the control system to permit communication between the control system and devices external of said housing. The first interface comprising an arrangement for applying a count signal to the control system. The second interface comprising an arrangement for applying encrypted control signals to the control system. The control system includes a first register for storing a current count corresponding to the count signal, a second register for storing an authorization count, an arrangement for applying an enable signal to the first interface when the count of the first register does not exceed the count of the second register, a decoding arrangement for decrypting control signals applied thereto to produce a decrypted signal, and an arrangement responsive to a valid decrypted signal for modifying the count in the second register.

REFERENCES:
patent: 4531826 (1985-07-01), Stoughton et al.
patent: 4629871 (1986-12-01), Scribner et al.
patent: 4853523 (1989-08-01), Talmadge
patent: 4858138 (1989-08-01), Talmadge

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