Multiplex Communications Network (MCN): Notes

Aboard this vehicle are several electronic components which can be controlled by an off-board tester to provide valuable self-diagnostic information. These components are part of an electrical system network, designed to control powertrain, chassis and body subsystems. The overall electronic network system consists of two micro-processor-based modules which interface through a common communication link. This communication link consists of a twisted wire pair (Data Bus Plus and Data Bus Minus) routed throughout the vehicle. Multiplex Communications Network signals are carried over an unshielded twisted pair. No special cabling is needed for the multiplex communication network. The wire pair is arranged in a "bus" configuration or party line, and is routed throughout the vehicle. Modules in the system connect to this bus so that the bus serves as a common tie point to each module. See Figure and Figure .