Abstract: The invention relates to a communication system comprising a control unit (100), a plurality of circuits (101-104) intended to be accessed by the control unit and a bus (105) intended to allow a data exchange between the control unit and an accessed circuit. In order to avoid that the circuits have specific address, they are accessed by the control unit in a predefined accessing order, and the system comprises means for changing an address of a circuit so that an accessed circuit has a predefined address. The circuits having no specific addresses, such a communication system is particularly easy to create or modify. The invention is particularly relevant for a dispatching station for TV signals.