TRAIN AND SECURE DETERMINATION PROCESS OF THE MAKEUP OF SUCH A TRAIN

This method for determining the composition of a train (1) including a plurality of vehicles grouped in successive units (10A, 10B, 10C) connected to each other, the train including: - a security management device (24A, 24B, 24C) per unit (10A, 10B, 10C), each device (24A, 24B, 24C) having two identifiers of its own, - a coupling communication link (12, 14) for each pair of adjacent units, - a general network (18) connecting all the devices (24A, 24B, 24C) to each other, comprises an initial step of transmitting, by each device (24A, 24B, 24C), an unsecured broadcast message over the general network (18), and a step of receiving, by each device (24A, 24B, 24C), messages containing the identifiers of the other modules. The method comprises the following steps: - transmitting, over the general network (18) and on each coupling communication link (12, 14), by at least one device (24A, 24B, 24C), a secure message intended for one of the devices (24A, 24B, 24C) adjacent to said device (24A, 24B, 24C), the message having one of the identifiers of said device (24A, 24B, 24C), - the transmission, over the general network (18), by each device (24A, 24B, 24C) having received an identifier of another device (24A, 24B, 24C) connected by a coupling communication link (12, 14), of at least one reconstitution message including the two identifiers of said device as well as the received identifier, - the receipt, by each device (24A, 24B, 24C), of the reconstitution messages transmitted, and - determination, by at least one device (24A, 24B, 24C), of the composition of the train. Ce procédé de détermination de la composition d'un train (1) comportant une pluralité de véhicules groupés en unités successives (10A, 10B, 10C) reliées entre elles, le train comportant : - un dispositif (24A, 24B, 24C) de gestion de la sécurité par unité (10A, 10B, 10C), chaque dispositif (24A, 24B, 24C) ayant deux identifiants qui lui sont propres, - un lien de communication d'attelage (12, 14) pour chaque paire d'unités adjacentes, - un réseau général (18) reliant tous les dispositifs (24A, 24B, 24C) entre eux, comprend une étape initiale d'émission, par chaque dispositif (24A, 24B, 24C), sur le réseau général (18), d'un message de diffusion non sécurisé et une étape de réception, par chaque dispositif (24A, 24B, 24C), de messages comportant les identifiants des autres modules. Le procédé comprend les étapes suivantes : - l'émission, sur le réseau général (18) et sur chaque lien de communicatio