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Monitoring apparatus

  • US 5,256,910 A
  • Filed: 11/18/1991
  • Issued: 10/26/1993
  • Est. Priority Date: 11/18/1991
  • Status: Expired due to Fees
First Claim
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1. Monitoring apparatus comprising:

  • a) an operator controllable switch;

    b) a first control means for controlling electrical circuits having a first and a second state, being connected to said switch and arranged such that said first control means will toggle between the first and the second state whenever said switch is closed for a first time interval of a predetermined length; and

    c) a second control means for controlling electrical circuits having a first and a second state, being connected to said switch and arranged such that said second control means will toggle between the first and the second state whenever said switch is closed momentarily; and

    d) first circuit means for logic control having a first and second state, being connected to said first control means and being controlled thereby such that said first circuit means will have the same state as said first control means, ande) counting means for counting the changes of state of said second control means, said counting means being connected to said second control means and arranged such that the count will increment upward by one upon each change of state of said second control means to a predetermined maximum count and will reset to zero and begin a new count on the next subsequent change of state; and

    f) multiplexer means having multiple inputs and a single output for selecting one of the inputs as an output, having as inputs a first class and a second class of voltage inputs with the number of each class of inputs being equal to the maximum count of said counter means; and

    g) said multiplexer means inputs, said multiplexer means, said first circuit means and said counter means being connected and arranged such that when said first circuit means is in the first state the multiplexer means output will be selected from among the first class of multiplexer means input voltages, and when said first circuit means is in the second state the multiplexer means output will be selected from among the second class of multiplexer means input voltages, and such that the individual multiplexer output of the selected class of inputs will determined by the count of said counting means.

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