Description
Almost all new automobiles produced today are required, by law, to provide an interface from which test equipment can obtain diagnostic information. The data transfer on these interfaces follow several standards, none of which are directly compatible with PCs or PDAs. The ELM327 is designed to act as a bridge between these On-Board Diagnostics (OBD) ports and standard PC RS232 ports.
The ELM327 builds on improved versions of our proven ELM320, ELM322, and ELM323 interfaces by adding four CAN protocols to them. The result is an IC that can automatically sense and convert the nine most common protocols in use today. There are a number of other improvements as well - a high speed RS232 option with data buffering, battery voltage monitoring, and the ability to remember the last used protocol, to name only a few.
The following is only a “Quick Summary” of the ELM327. For Example Applications, and a more detailed discussion of the many features, download the full datasheet.

Features
• Supports 9 OBDII protocols
• Automatically searches for a protocol
• Fully configurable with AT commands
• High and Medium speed RS232
• Voltage input for battery monitoring
• Low power CMOS design

Applications
• Diagnostic trouble code readers
• Automotive scan tools
• Teaching aids