The Allen-Bradley 2711-B5A9 is a Panelview 550 HMI featuring a 5.5-inch monochrome LCD, both keypad and touchscreen input, and RS-232 communication capabilities. With 170 KB application memory and operating on 120 VAC, this series A to H has been discontinued, but was widely used for machine control interfacing. Brand Allen-Bradley Part Number/Catalog No. 2711-B5A9 Product Line Panelview 550 Display Size 5.5 in. Display Color Monochrome LCD blue mode Input Type Keypad and Touchscreen Communication RS-232 (DH-485) Communication and RS-232 Printer Port Input Power 120 VAC Software Panelbuilder 32 Memory 170 KB application runtime Backlight 2711-NL1 Communication Cable 2711-NC13 Shipping Weight 6 lbs Shipping Dimensions 14x11x8 inches Series A,B,C,D,E,F,G,H Firmware 1.00-4.48 Product Lifecycle Status* Discontinued/Obsolete