System for bilateral communication of a command station with rem

Details System for bilateral communication of a command station with rem System for bilateral communication of a command station with rem

1985-06-20

1987-06-09

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

3408251, 34082554, H04Q 100

Patent

active

046723749

ABSTRACT:
A remote sensing and control system wherein a plurality of remote sensing units are connected to a central control and monitoring console by only four interconnecting wires. A clock signal is converted to a plurality of parallel address signals at the local monitoring console and also at the remote sensing units located up the building. A sync signal is employed to synchronize all of the serial-to-parallel converters in the system, and each remote unit is provided with a specific code and is identified by selectively routing one or more signals through an inverter located at each unit so that the signals trigger a logic device in the particular time slot assigned to each remote unit. The input circuitry of each remote sensing unit compares two reference signals derived from the least significant bit of the address signals with the return signal from the sensing device to sense for opens, grounds, normal conditions, and alarms. The system is adapted to operate with conventional computing means and programmable read only memories, as well as a multiplexer unit, for providing control signals to operate controlling devices upon the occurrence of predetermined signals from the sensing device. Monitoring of command functions to activation remote devices is also provided.

REFERENCES:
patent: 3559177 (1971-01-01), Benson
patent: 3921168 (1975-11-01), Dunbar
patent: 3963869 (1976-06-01), Caldwell
patent: 4067008 (1978-01-01), Sprowls, III
patent: 4342985 (1982-08-01), Desjardins

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