Control device for an automatic vending machine

Details Control device for an automatic vending machine Control device for an automatic vending machine

1987-03-04

1988-11-08

Smith, Jerry

Boots, shoes, and leggings

364186, G07F 1100

Patent

active

047837470

ABSTRACT:
Control apparatus and method is disclosed for a processor controlled vending machine. The control device includes a trigger signal generating circuit for periodically generating a trigger signal. The processor is responsive to the trigger signal to compare the value of the program counter and stack pointer to predetermined limits. If the value of the program counter and stack pointer is within a predetermined range (i.e., the values of the program counter and stack pointer is within the predetermined limits) then the processor does not determine that a vending machine malfunction has occurred. If, however, the value of the stack pointer or the program counter is not within the predetermined range, then the processor determines that a malfunction has occurred and provides a port signal. A reset signal generating circuit is responsive to the port signal to provide a reset signal, which reset signal is used to reset the mechanical and electronic systems of the vending machine.

REFERENCES:
patent: 4399354 (1983-08-01), Schaeffer
patent: 4442345 (1984-04-01), Mollier et al.
patent: 4553211 (1985-11-01), Kawasaki et al.
patent: 4646861 (1987-03-01), Kawato et al.

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