A driveshaft assembly includes a yoke including a body portion, a pair of opposed yoke arms that extends generally in a first axial direction from the body portion, and a neck portion that extends generally in a second axial direction from the body portion. The gap is composed of gap sections having different longitudinal directions, and magnetic field sensitive elements are accommodated in one or more gap sections disposed parallel to each other. The method comprises the steps of covering the open top of the hopper body with a safety door; opening and closing the safety door using a hydraulic actuating cylinder; and preventing the powered implement from operating whenever the safety door is not in its closed position, under the control of an interlock device coupled between the hydraulic actuating cylinder and the hydraulic motor. When the network node detects that the special packet provided with the unique code returns back, it may conclude that on the path of the connection to which the unique code is associated to, there is a loop that should be eliminated. The varying depths, dx, provide means for varying the peak voltage of each individual diode.