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As more automobile designs utilizing serial multiplex network protocols such as SAE J1850 and CAN go into production, automotive system designers must now seek ways to lower the cost of the multiplex communication devices used in order to allow the number of components communicating across the multiplex bus to expand. The first generation of J1850 multiplex devices were designed as the different versions of the protocol were being developed and as a result seem better suited for use as development tools rather than for use in cost-sensitive production applications. As the next generation of multiplex devices is being defined, a hard look needs to be taken at the actual system requirements for communication on a multiplex bus.