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Automatic device selection circuit

  • US 4,443,866 A
  • Filed: 08/27/1975
  • Issued: 04/17/1984
  • Est. Priority Date: 08/27/1975
  • Status: Expired due to Term
First Claim
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1. A device interconnecting system for automatically assigning a unit address to each device depending upon the position of the device in a chain of devices, said system comprisingcontrol means having N terminals, said control means being capable of energizing any one or more of said N terminals,N controlled devices, each having first and second sets of terminals, each of said sets of terminals having N terminals, each terminal in said first and second sets being designated by a different one of the numerals 1 through N, respectively, the first terminal of said first set of terminals being connected to the device with which said set is associated, each of the remaining of said first set of terminals of each device being connected to the next lower numbered terminal of the second set of terminals that is associated with the device,N cables, each having N conductive leads therein, one of said cables being connected between said N controller terminals and a first one of said N controlled devices, and each of the remaining (N-1) of said cables being connected between the second set of terminals of a respective one of said N devices and the first set of terminals of the next adjacent one of said N devices, each of said cables having polarized terminations whereby a first lead in each cable is connected between the first terminal of the two sets of terminals to which that cable is connected, the Nth lead in each cable is connected between the Nth terminal of the two sets of terminals to which that cable is connected, and each of the remaining leads in each cable is connected between corresponding terminals of the two sets of terminals to which that cable is connected,whereby the first terminal of said control means becomes connected to the first controlled device in the chain of devices extending from said control means, and each of the second through the Nth terminals of said control means becomes connected to the respective one of the second through the Nth controlled devices in the chain of devices extending from said control means so that the unit address of each device is automatically determined in accordance with the position of that device in the chain of devices extending from said control means.

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