Abstract: The invention relates to a control system of a coating apparatus for a coating medium, such as powder or wet lacquer, comprising at least one coating device, in which a quantity measuring means for determining the amount of coating medium supplied to the coating device, a quantity control means for setting the quantity of the coating medium to be discharged by the coating device, and a digital control device for controlling the operation of the coating device are associated to the or any coating device, wherein the control device, the quantity measuring means and the quantity control means are connected to one another by a bus structure.