The buttons 0-9 are the keypad, type your floor number using those. Use OK to confirm. (for example, press 2-5-OK for floor 25) Use X to clear. Lowest floor is 1, highest floor is 80.
Based on Otis Series M2 fixtures, though the real destination dispatch does not look like this (uses Compass series dispatch systems). This was from an idea I had of a KONE destination dispatch system with Otis M2 buttons.