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The Allen-Bradley 2711-K5A5L1 is a versatile Human Machine Interface (HMI) from the PanelView Standard Operator Terminal family, engineered for real-time monitoring and control of machines and processes. It features a 5.5-inch monochrome display with a resolution of 256 x 128 pixels, supported by an internal backlight rated for up to 100,000 hours. This robust device facilitates data exchange through its RS232 interface using the DH485 protocol, and offers advanced alarm handling and customization with its ten function keys, numeric keypad, and navigation keys. Operating on an 18 to 32 VDC power supply, it contains 170KB of RAM and 240KB of expandable non-volatile memory via ATA memory cards. Its compact design and 6-pound weight make it convenient for installation and use in various industrial settings.