For applications where several serial RS-232, RS-422 or RS-485 devices need to be connected together over large distances, the Westermo range of industrial multidrop modems ensure reliable communications in the harshest environments. Westermo multidrop modems act as transparent line sharers, where a master device needs to communicate with a number of slaves, for example, data being collected from a number of substations and then transmitted back to an SCADA.