Texas Instruments Corporation

Lexmark International, Inc.

Mark A Eifler

Mitchell R Rowlette

Mark Eric Miller

Ronald E Garnett

Craig M Nold

Charles Edward Gregory

Alan R Sawyers

A system and method of accessing dynamic web content from a peripheral are presented. An embodiment of the method includes the acts of providing a graphical user interface (GUI) on the peripheral, the GUI including a plurality of elements selectable by a user; associating at least one element with a script configured to access dynamic web content when executed; detecting selection of the element; and presenting accessed dynamic web content to the user. The system and method are independent of a web browser or a personal computer.

System and method of accessing dynamic web content from a multifunction printer using standard protocols

A gas furnace control for two stage gas furnaces which can be used with either a single stage or a two stage room thermostat monitors the length of time the first, low combustion, stage is energized and upon exceeding a selected period of time, e.g., 10 minutes, energizes the second, high combustion stage. Energization of the second stage signal (W,) also energizes the second stage without regard to timing of the first stage.

Universal two stage gas furnace ignition control apparatus and method

A microprocessor based control for monitoring oil pressure of compressors can use a normally open or a normally closed pressure switch (S,S,) and LED indicator (LED,) having a diode isolated power supply (VDD,SENSOR) separate from the power supply (VDD) of the microprocessor (U,). Timing of the microprocessor is derived from the frequency of the line (60 Hz). The microprocessor is normally in a sleep mode and is awakened by each 60 Hz interrupt to check the condition of the pressure switch, the accumulated time that inadequate pressure has occurred and whether the relay needs to be energized and then returns to the sleep mode. The resulting reduced power requirement enables extended retention of accumulated &ldquo;bad&rdquo; oil time. Since oil pressure does not build-up to a satisfactory level for the first eight seconds or so upon start-up, the microprocessor senses whether the oil pressure indicates good oil immediately upon start-up which indicates a fault condition and if so will shut the system down but only after approximately four seconds which allows the compressor to be jogged, or momentarily energized, to force refrigerant out of the compressor and into the system, which is necessary on initial start-up of the compressor system.

Differential oil pressure control apparatus and method

An electric control is shown adapted for use with gas furnaces which controls fan motors, ignition controls and a gas valve based on inputs from a room thermostat, limit switches, a flame probe, a flame roll-out probe, and a condensate sensor. A roll-out detection circuit utilizing flame rectification includes a multidirectional roll-out probe 16 coupled to a microcontroller (U2) through an inverter (U3) to provide both fault both protection and fault identification. A condensate sensor (20) in the form of a conductive condensate sensor member is also coupled to the microcontroller (U2) through an inverter (U3) to detect the presence of condensate build-up.

Combined fan and ignition control with selected condition sensing

An electronic control for gas furnaces controls a two speed main blower fan and an induction draft fan based on 24 volt input signals from a room thermostat, a high limit and an ignition control including a gas valve. The input signals are coupled to input ports of a microprocessor through current limiting resistors and to AC ground through pull down resistors. AC ground is also connected to the IRQ port of the microprocessor. Output ports of the microprocessor are connected to a relay driver which in turn is connected to relays for energizing and de-energizing the fans. The control calibrates itself on a continuing periodic basis to read the AC inputs synchronously at the peak of their wave and can switch the relays asynchronously based on the Real Time Clock of the microprocessor or can be switched synchronously by providing a selected delay so that contact engagement and disengagement occurs at or near the zero crossing of the AC line voltage wave form. When used with resistive loads the relays are switch in response to a signal from the microprocessor which is delayed based on the mechanical switching time constant of the relays to provide contact closure and opening at the selected point on the AC line voltage wave form. An alternate embodiment shows a feedback network used to calibrate the specific delay period for each relay upon initialization. When used with inductive loads contact closing can be effected synchronously and contact opening asynchronously.

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Frankfort, KY, United States of America

Mark A Eifler