G - Physics – 08 – C
Patent
G - Physics
08
C
363/10, 340/92
G08C 15/06 (2006.01)
Patent
CA 1059593
ABSTRACT Remote units are connected in parallel to a monitoring and control center by a monitoring wire, a control wire, and a plurality of signal wave carrying wires each conveyinq signal waves of progressively doubled wave len- gth. The remote units are each coded and identified by selectively routing one or more signal waves through an inverter at each unit so that the signal waves trigger an AND gate in a given time slot for each remote unit. Accord- ing to the open/closed status of a switch, the triggering of an AND gate sends a signal through the monitoring wire for each unit in the time slot for that unit. The center sequentially monitors each remote unit in its tine slot and indicates its status. Each remote unit may include a relay which is act- ivated from the center through the control wire during the time slot for that unit. At the center a relay operated switch and a connection may be added to enable a status of one remote unit to control another remote unit.
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