A man-machine interface (2) for an agricultural implement (9) to be controlled or controlled via an ISO data bus (10), having a screen (4) and having a plurality of softkey entry keys (5,6) dependent from a corresponding screen display of the screen (4) perform different functions, wherein the soft key input buttons (5, 6) as hardware buttons or areas of the screen formed as a touch screen (4) are formed, wherein first softkey input keys (5) corresponding functions are pre-assigned on the control side, whereas second softkey input keys (6) with corresponding functions are freely assignable. At least one of the second softkey input keys (6) is assigned a function for adjusting an operating parameter of the implement (9) to be controlled or actuated such that the corresponding operating parameter in the case of a tip-like actuation of the respective second softkey enter key (6) a defined adjustment range in a first adjustment direction is adjustable, and that with permanent actuation of the respective second soft key input key (6) of the corresponding operating parameter in the defined adjustment range in a second, opposite adjustment direction is adjustable.
