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Carlo Gavazzi - Dupline

Communication principle_______________________

DuplineŽ signal transmission is based on a timedivision multiplexing principle that provide a more efficient transmission of simple signals than the traditional message-oriented method. This has made it possible to run DuplineŽ on a low carrier frequency of 1 kHz, which is the key for DuplineŽ features like long-distance transmission, high noise immunity and robustness. The Controller generates a square-wave signal consisting of an 8 ms synchronization period followed by 128 pulses each with a length of 1 ms. This 136 ms pulse train is repeated continuously. Each pulse defines a time slot where those modules assigned to that specific pulse number are allowed to transmit and receive information. So, in fact the I/O modules are sharing the same two wires by using them in turn. The response time in a DuplineŽ system is always below 272 ms, regardless of the number of nodes and active signals in the network.