The invention concerns a data transmission method, and its implementing device, in an integrated closed system of computers, such as, for example, in an aerial or land vehicle, comprising a step which consists in transmitting point-to-point data between two transmission nodes, for example via a wire system, each node having one or more channels enabling each transmission with a single node, a step which consists in converting data for transmission thereof, for example, in series. The invention is characterized in that it does not comprise any step of physical or logical control for authorizing and/or validating the transmitted data so that any data reception at a node is unconditionally followed by a retransmission, that is the control of the dataflows is implicitly determined by the cabled topology used.