Basic components_____________________________________________________________________________ A Dupline® network consists of 4 basic elements: A Central unit, input modules, output modules and a 2-wire cable. The Central Unit controls the communication in all Dupline® installations. It sends out the Dupline® carrier signal and coordinates all transmission between input and output modules. Input modules connect to contacts, voltages and analog signal sources etc. and transmit this information via the 2-wire cable. Some input modules are sensors with integrated transducer hence no external signal source is required. Output modules connect to lamps, contactors, LEDs, instruments etc. and control these devices according to the information received via the Dupline® network.