The Hyosung 2700 FDK cable (Function Display Key cable) is a specialized internal data harness used to connect the side function keys to the ATM's main control board. In the Nautilus Hyosung 2700 series, these keys are the tactile buttons located on either side of the 10.1" or 10.2" LCD screen that allow users to select on-screen menu options. 

• Function: Transmits input signals from the function keypads (FDKs) to the Main Control Board (MCB) for processing.
• Configuration: It typically consists of a multi-pin ribbon or flat cable assembly designed to fit the specific pin headers on the Hyosung 2700 mainboard
• Compatibility: While specifically designed for the NH-2700 and 2700CE models, similar FDK cables are often used across related Hyosung models like the Halo or 1800 series, though pinouts may vary.
• Variants: Replacement parts are often sold as specific Left Function Key Cables or Right Function Key Cables, as the lengths and routing requirements differ depending on which side of the bezel they serve.