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This communicates with the CAN, ISO and J1850 transceivers. The STN1110 is the main controller chip on the board. The schematic can be viewed/downloaded here. The OBD-II UART board has both the STN1110 and the MCP2551 chips populated on it, allowing the user to access both CAN and OBD-II protocols. ScanTool has some great resources for the STN1110 available on their website, including:
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Based on a 16-bit processor core, the STN1110 offers more features and better performance than any other ELM327 compatible IC. It is fully compatible with the de facto industry standard ELM327 command set. STN1110 is an OBD to UART interpreter that can be used to convert messages between any of the OBD-II protocols currently in use, and UART. You can read more about the OBD-II protocol here. A wealth of information can be obtained by tapping into the OBD bus, including the status of the malfunction indicator light (MIL), diagnostic trouble codes (DTCs), inspection and maintenance (I/M) information, freeze frames, VIN, hundreds of real-time parameters, and more. A large portion of the modern vehicle fleet supports OBD-II or one of its regional flavors.Īmong other things, OBD-II requires that each compliant vehicle be equipped with a standard diagnostic connector (DLC) and describes a standard way of communicating with the vehicle’s computer, also known as the ECU (Electronic Control Unit).
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Other countries, including Canada, parts of the European Union, Japan, Australia, and Brazil adopted similar legislation. It was first introduced in the United States in 1994, and became a requirement on all 1996 and newer US vehicles. On-Board Diagnostics, Second Generation (OBD-II) is a set of standards for implementing a computer based system to control emissions from vehicles.