Serial Data Communication Protocols — WSU

Serial Data Communication Protocols — WSU -...

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Serial Data Communication Protocols When multiple on-board computers need to communicate with each other, they must speak the same language (protocol) at the same speed (baud rate). Starting in 1996, U.S. EPA regulations require that all automobile manufacturers establish a common communications system for emissions related controllers. As it turned out, there were four different protocols used with a common data link connector (DLC). This section describes the four different communication protocols used by most automobile manufacturers since 1996. Starting in 2008, U.S. EPA regulations require that all automobile manufacturers use a single common communications protocol for emissions related controllers. This section describes the new standardized communication protocol; Controller Area Network (CAN). The most significant result of these regulations is that the regulation provides the scan tool manufacturers
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