A vertical tilling implement to be pulled behind and agricultural vehicle having a number of gangs of fluted-concave disc blades, rolling baskets, and wheels connected to a main frame. The method comprises transmitting a data frame from an egress port of one end system node to the ingress port of another end system node, the receiving end system node then determining whether it is the final destination for the data frame. The present invention further provides a method of manufacturing a lung simulator. The information is then transmitted to a common service platform. An ECU shifts a phase of a cam shaft toward a control target value A at a reference update speed C1 when it is judged that a rider does not desire an output increase, and shifts the phase of the cam shaft toward the control target value A at a transient update speed C2 higher than the reference update speed C1 when it is judged that the rider desires an output increase.