ELM327 OBD to RS232 Interpreter Integrated Circuit
data sheet for firmware version 1.4b
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The ELM327 is an integrated circuit that was created by Elm Electronics for use with vehicle On Board Diagnostic (OBD) systems. It supports all of the currently mandated protocols (SAE J1850 VPW and PWM, ISO 9141-2, ISO 14230-4, and ISO15765-4) as well as others (SAE J1939, etc.).
This book describes the product in detail, as well as offering background information, and examples of how it might be used.