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Almost all of the automobiles produced today are required, by law, to provide an interface for the connection of diagnostic test equipment. The data transfer on these interfaces follow several standards, but none of them are directly usable by PCs or smart devices. The ELM327 is designed to act as a bridge between these On-Board Diagnostics (OBD) ports and a standard RS232 serial interface.

In addition to being able to automatically detect and interpret nine OBD protocols, the ELM327 also provides support for high speed communications, a low power sleep mode, and the J1939 truck and bus standard. It is also completely customizable, should you wish to alter it to more closely suit your needs.

The following pages discuss all of the ELM327’s features in detail, how to use it and configure it, as well as providing some background information on the protocols that are supported. There are also schematic diagrams and tips to help you to interface to microprocessors, construct a basic scan tool, and to use the low power mode.


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


  • Power Control with standby mode
  • Universal serial (RS232) interface
  • Automatically searches for protocols
  • Fully configurable with AT commands
  • Low power CMOS design

Connection Diagram

( PDIP or SOIC, top view )
ELM327 connection diagram

Block Diagram

ELM327 block diagram


The ELM327 data sheet (ver J, 453K):

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The ELM327 quick data sheet (42K):

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The ELM327 data sheet iBook (11MB):


AT Commands supported by each version (55K):

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Quantity Pricing

The following are the unit prices, as you vary the quantity purchased:






All prices are in Canadian dollars. We use the total number of v2.1 ICs purchased (ELM327P + ELM327SM) for the calculation.


Select the desired integrated circuit package type, then the quantity desired, before adding it to your shopping cart. Quantity discounts will be applied as appropriate.

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