Thermostat interface for a refrigeration system controller
First Claim
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1. An interface for use between a thermostat and a controller for an HVAC system comprising:
- means for receiving a plurality of parallel commands from a thermostat where each command represents one of two possible states;
means for converting each of said plurality of parallel commands into a plurality of predetermined values;
means for combining said predetermined values in a predetermined manner; and
means for transmitting said combined predetermined values to the controller.
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Abstract
An interface for use between a thermostat and a controller for an HVAC system comprising: means for receiving a plurality of parallel commands from a thermostat where each command represents one of two possible states; means for coverting each of the plurality of parallel commands into a plurality of predetermined values; means for combining the predetermined values in a predetermined manner; and means for transmitting the combined predetermined values to the controller.
84 Citations
19 Claims
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1. An interface for use between a thermostat and a controller for an HVAC system comprising:
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means for receiving a plurality of parallel commands from a thermostat where each command represents one of two possible states; means for converting each of said plurality of parallel commands into a plurality of predetermined values; means for combining said predetermined values in a predetermined manner; and means for transmitting said combined predetermined values to the controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling an HVAC system including a thermostat which transmits discrete change of state information and a system controller which accepts analog information as an input, comprising the steps of:
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receiving the discrete change of state information from the thermostat in an interface; converting the discrete change of state information into predetermined analog values; combining selected predetermined values in a predetermined fashion; and transmitting said combined selected values to the system controller. - View Dependent Claims (11, 12, 13, 14)
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15. A system for controlling an HVAC system comprising a thermostat, an interface and a controller:
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the thermostat including a temperature sensor, a mode selector, at least one setpoint selector, means for generating commands in response to the temperature sensor, the mode selector and the set point selector, and means, responsive to said command generating means, for transmitting a plurality of commands in parallel on a plurality of transmission lines; the interface including means for receiving said plurality of commands from said thermostat on said plurality of transmission lines, means for converting said plurality of commands to predetermined analog values, means for transmitting an identification signal to a controller, means for combining said converted commands in a preselected manner, and means for transmitting said combined commands to the controller; the controller being operatively connected to said interface and including means for recognizing said identification signal, means for receiving said combined commands, and means for controlling a compressor, a condenser, and condenser fans in response to said combined signals. - View Dependent Claims (16, 17)
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18. A method of converting parallel digital commands to parallel analog information comprising the steps of:
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acquiring information relative to a zone whose climate is to be controlled; generating, using the acquired information, a plurality of commands indicative of the desired states of particular pieces of heating, ventilating or air conditioning equipment; transmitting said commands in parallel on a plurality of wires; receiving the plurality of commands in an interface; converting each of the plurality of commands to predetermined analog values; combining the predetermined analog values in a predetermined manner; transmitting said combined selected values to the controller; receiving said combined selected values in the controller; using the combined selected values as indices to a system command look up table having system commands; and controlling an HVAC system in accordance with the system commands in the look up table. - View Dependent Claims (19)
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Specification