Since 1980, electronic control units (ECU) in vehicles have been implemented controller area network (CAN) bus to communicate with each other in favour of driving stability, safety, comfort and
fuel economy. More than 40 communication protocols base on CAN-bus are developed so far, and classified by the society of automobile engineering (SAE) into three classes-class A, class B, and class C. They are widely applied to the majority of the subsystems in a vehicle, such as power, chassis, air condition, body, and diagnostic system etc. The related com- munication protocol used in the truck, passenger-cargo carriage, and vessel is called SAE J1939, while that used in limousine is SAE J2284. Additional relevant standards to the automobile CAN-Bus protocol are proposed by the International Standards Organization (ISO), such as ISO 11898, ISO 15765, and ISO 14229.
In recent years, LYSSEN ENTERPRISE CO., LTD. focuses on the development of CAN-Bus meter. They have three different types which are called the master-slave meter, the multi-channel meter, and information central meter.
A stepping motor with PWM controller serves to drive these meters with a professional-level accuracy of 1/12 degree.

The diagnostic messages of information center come from sensors of the vehicle or CAN-Bus data in the vehicle communication system. It will show alarm or diagnostic messages in alarm signals or LCD display, includes graphic and text messages. There are different options can be customarily selected according to the specific application.

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