A method for serial data transmission between a position-measuring device and subsequent electronics over a bidirectional data channel includes transmitting data in data frames and in encoded form in accordance with a data transmission code. The use of the screw is further cooperated with the reconstruction plate to reinforce the stability of the connection between the reconstruction plate and the screw to prevent the screw from withdrawing, moving, angle changing or movement of the reconstruction plate. A longitudinally extending blade element is fixedly attached to the rear support portion at a proximal end thereof and substantially fixed relative to a leg of the wearer by at least one support member at a distal end thereof. The compensator provides a feedforward compensation signal configured to compensate for a mechanical disturbance predicted to be induced by a controlled motion of the actuator, and applies the feedforward compensation signal to a signal that controls the motion of the actuator. The differential voltage, where no errors are detected, is scaled by a proportion of a target confidence level to a measured confidence level associated with the reasonable length training pattern. This \u201cwavy wall\u201d embodiment provides a more uniform dosage to the fluid parcels formed within the annular gap of the reactor than the smooth wall embodiment.