Importance

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Abstract

An elevator door monitor includes a differential amplifier having an input and an output, the input configured to electrically communicate with a source configured to output one of a change-of-state voltage, and a change-of-state voltage value, with respect to an elevator control parameter, the differential amplifier configured to produce an output voltage correlating to a magnitude of the change-of-state voltage or to the change-of-state voltage value; and a microcontroller in communication with the output of the differential amplifier, the microcontroller configured to convert the output voltage from the differential amplifier to a numeric value, compare the numeric value to a setting value, and responsive to a determination that the numeric value reaches a threshold associated with the setting value, send a signal to an output relay control module, the signal comprising one selected from the group of a “true” signal and a “false” signal.

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First Claim