Abstract: This data communication system employing carrier currents comprises a power supply (4), to which are connected supply lines (2, 3) to which supply lines are connected functional devices (6) of the vehicle communicating with one another. These functional devices (6) comprise a communication interface (10) and an associated application equipment (12) communicating with other functional devices (6) through its communication interface (10), the communication interface (10) comprising means for testing the validation of at least one predetermined criterion and means commanding control means of the power supply of the associated application equipment (12) for commanding, as a function of the validation of the predetermined criterion, the feeding or otherwise of the associated application equipment (12) by the supply lines (2, 3).

Abstract: This device includes a signal processor (30,35,36,37,38,47,49) to generate sampling signals of information present on a network, and a selection circuit (43) for loading the signal processor with at least one synchronization value (44, 45) corresponding to at least one propagation time for information in the network to synchronize the station according to the transmission characteristics of the network.

Abstract: This method is characterized in that the data is encoded in the form of blocks of four bits in five-bit words, three bits (7) of each block being encoded according to the NRZ encoding method and one bit (8), according to the Manchester encoding method.

Abstract: This device includes a control signal generator receiving as input a clock signal whose active front is synchronous with the bits of the mesh, and a reinitialization signal before each comparison, and whose group of outputs is connected to a parallel-series converter receiving as input the reference in parallel form from a programmable reference generator receiving as input an initial reference and a signal of variable level depending on the time, this reference generator being adapted to deliver a programmed reference depending on the desired bit maskings, the output of the parallel-series converter delivering a signal representative of the selected bit of the reference and being connected to the input of means of detection of transition of the output signal of the converter and of generation of a signal for inhibiting the current processing of a bit in response to the detection of a transition in this signal.