Interface adapter for interfacing a remote controller with commercial refrigeration and environmental control systems
Patent 4829779 Issued on May 16, 1989. Estimated Expiration Date: 
December 15, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 15, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3343132 3423454 3513662 3628904 3707080 3813533 3871443 Refrigeration system control method and apparatus Method and system for controlling a plurality of temperature conditioning units Air conditioning control system with local and remote control capabilities InventorsAssigneeApplicationNo. 07/133370 filed on 12/15/1987US Classes:62/175, Diverse, cascade or compound refrigeration-producing system236/51, DISTANCE-ADJUSTED340/870.17TemperatureExaminersPrimary: Wayner, William E.Attorney, Agent or FirmInternational ClassesF24F 11/00 (20060101)F25D 29/00 (20060101) G05D 23/19 (20060101) AbstractAn interface adapter for use in combination with a commercial installation having a central refrigeration system with multiple compressors and refrigerated units and also having environmental apparatus for regulating the heating, ventilating and air conditioning of such installation. The refrigeration system has a local control apparatus for operating the system in response to local status signals and has remote control input ports for remote control of the system. A remote electronic controller adapted to receive the local status signals and to override at least part of said local control means operates the refrigeration system by generating an electrical control signal and a switchback signal indicating that the electrical control signal should be recognized. The interface adapter electronically isolates and interfaces the refrigeration system and the remote controller. The interface adapter includes a circuit responsive to the switchback signal for providing the electrical control signal of the remote controller with the remote input ports of the refrigeration system. The interface adapter may also include a circuit for providing at least one of the local status signals to the remote controller. As a result, the interface adapter permits a corresponding control signal to be provided to the remote control input port of the system even though the electrical characteristics of the remote control input port may be incompatible with one of the corresponding electrical characteristics of the control signal.Other References
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