Abstract: An online software upgrade device for maintaining operation uninterrupted is disclosed. One embodiment includes a processing unit having first power and chip enabling pins and a controlling pin, an expansion I/O chip having second power and chip enabling pins and a controlled pin, and a pull-down resistor having a first end connecting with the first and second chip enabling pins. The first power enabling pin outputs a first power enabling signal and connects a power source, the first chip enabling pin outputs a first chip enabling signal and connects a driving pin of a controlled chip, and the controlling pin outputs an operation signal. The second power enabling pin connects with the first power enabling pin and outputs a second power enabling signal, the second chip enabling pin connects the first chip enabling pin and outputs a second chip enabling signal, and the controlled pin connects with the controlling pin.

Abstract: An online software upgrade device for maintaining operation uninterrupted is disclosed. One embodiment includes a processing unit having first power and chip enabling pins and a controlling pin, an expansion I/O chip having second power and chip enabling pins and a controlled pin, and a pull-down resistor having a first end connecting with the first and second chip enabling pins. The first power enabling pin outputs a first power enabling signal and connects a power source, the first chip enabling pin outputs a first chip enabling signal and connects a driving pin of a controlled chip, and the controlling pin outputs an operation signal. The second power enabling pin connects with the first power enabling pin and outputs a second power enabling signal, the second chip enabling pin connects the first chip enabling pin and outputs a second chip enabling signal, and the controlled pin connects with the controlling pin.

Abstract: A method of assembling a housing assembly is provided. The method includes providing a housing that includes an access panel and a cavity defined therein, wherein the housing is sized to enclose at least one electrical system within the cavity. A portion of the housing is enclosed with a cover such that the access panel remains accessible and the cover is positioned against the portion of the housing. At least one gasket is coupled between the housing and the cover such that a seal is formed on the housing assembly that substantially prevents fluid from entering the housing assembly.

Abstract: A method of assembling a housing assembly is provided. The method includes providing a housing that includes an access panel and a cavity defined therein, wherein the housing is sized to enclose at least one electrical system within the cavity. A portion of the housing is enclosed with a cover such that the access panel remains accessible and the cover is positioned against the portion of the housing. At least one gasket is coupled between the housing and the cover such that a seal is formed on the housing assembly that substantially prevents fluid from entering the housing assembly.