M12-3S is a M12 Y-connector for series connection of DYNlink devices with the StatusBus function. Connector #2 is a M12-5 female connector for connection of the DYNLINK safety device, connector #1 is a M12-5 male connector for connection of +24VDC, 0V, the incoming DYNlink signal and the StatusBus and connector #3 is a M12-5 female connector for the outgoing inverted DYNlink signal towards another DYNlink safety device or safety controller/PLC.