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The ELM327 is a programmed microcontroller produced for translating the on-board diagnostics (OBD) interface found in most modern cars. The ELM327 command protocol is one of the most popular PC-to-OBD interface standards and is also implemented by other vendors.
OpenXC could offer a standard interface, similar to the ELM327 interface. An OBD interface may be complex to implement, while the OpenXC API is designed to be friendly for application developers; Possible advantages of using the OBD interface include Use well established existing OBD interface hardware and software, e.g. using the ELM327 protocol
OBD-II is an improvement over OBD-I in both capability and standardization. The OBD-II standard specifies the type of diagnostic connector and its pinout, the electrical signalling protocols available, and the messaging format. It also provides a candidate list of vehicle parameters to monitor along with how to encode the data for each.
OBD-II PIDs (On-board diagnostics Parameter IDs) are codes used to request data from a vehicle, used as a diagnostic tool. SAE standard J1979 defines many OBD-II PIDs. All on-road vehicles and trucks sold in North America are required to support a subset of these codes, primarily for state mandated emissions inspections .
Typical simple USB KKL Diagnostic Interface without protocol logic for signal level adjustment. Computers can be used to decode on-board diagnostics (OBD) data to a visual display. Many interfaces are based on the ELM327 OBD Interpreter ICs. [citation needed] STN1110 is also known to be used. [14]
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