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Logic interchange system

  • US 4,808,994 A
  • Filed: 08/27/1987
  • Issued: 02/28/1989
  • Est. Priority Date: 08/27/1987
  • Status: Expired due to Term
First Claim
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1. A controller system comprising the combination ofa control location having a plurality of programmable control modules, each said module having an input device connected thereto for supplying to said module an input signal capable of having only two states;

  • a plurality of programmable controlled modules, each said controlled module having an output device connected thereto for performing a specified function, said controlled modules being physically separated from said control location;

    each said control and controlled module being substantially identical to each other said control and controlled module apart from programming,a cable having no more than four operative wires interconnecting all of said control modules and all of said controlled modules and spanning the physical separation therebetween;

    means connected to one of the wires in said cable for producing and delivering to said control and controlled modules a sequence of clock pulses of uniform duration periodically interrupted by an interval of no clock pulses to synchronize the operation of said modules; and

    encoding/decoding means including a clock pulse counter in each of said control and controlled modules programmed to permit each said module to respond to a preselected count of said counter to thereby assign to each said module a unique code and thereby uniquely operatively associate each of said control modules with preselected one or ones of said controlled modules programmed to respond to the same count so that a control module responds to an input signal supplied to said control module by the input device connected thereto by producing and coupling to said four-wire cable a control signal at the count unique to said control module and so that said control signal generated by said one control device is recognized and acted upon by only said selected one or ones of said controlled modules programmed to respond to the same count to produce output signals for causing said output device or devices connected thereto to perform said specified functions.

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