Card of connection in network for analogical head offices ZP2-Fx, which there allows to create a redundant and robust network of 32 nodes, across RS485. Every node can be an analogical bow of a head office of fires or a relay panel. When one gives the case to overcome 1500 meters of distance between 2 nodes or when there could arise problems of EMC's interferences there is recommended a convertor of copper / fiber. It allows facilities Class To or B. A card is needed by each of the head offices that are going to form the network.