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ELM327DSH Elm Electronics – Circuits for the Hobbyist
www.elmelectronics.com
Error Messages and Alerts (continued)
message, but it was only displayed when a protocol
initiation or search was interrupted. As of version 1.4,
the message is printed any time that an OBD task is
interrupted.
UNABLE TO CONNECT
The ELM327 has tried all of the available
protocols, and could not detect a compatible one. This
could be because your vehicle uses an unsupported
protocol, or could be as simple as forgetting to turn the
ignition key on. Check all of your connections, and the
ignition, then try the command again.
Outline Diagrams
The diagrams at the right show the two package
styles that the ELM327 is available in.
The first shows our ELM327P product in what is
commonly called a ‘300 mil skinny DIP package’. It is
used for through hole applications.
The ELM327SM package shown at right is also
sometimes referred to as 300 mil, and is often called
an SOIC package. We have chosen to simply refer to
it as an SM (surface mount) package.
The drawings shown here provide the basic
dimensions for these ICs only. Please refer to the
following Microchip Technology Inc. documentation for
more detailed information:
• Microchip Packaging Specification, document name
en012702.pdf (7.5MB). At the www.microchip.com
home page, click on Packaging Specifications, or go
to www.microchip.com/packaging
• PIC18F2480/2580/4480/4580 Data Sheet, document
name 39637d.pdf (8.0MB). At the www.microchip.com
home page, click on Data Sheets, then search for
All rights reserved. Copyright 2005 to 2010 by Elm Electronics Inc.
Every effort is made to verify the accuracy of information provided in this document, but no representation or warranty can be
given and no liability assumed by Elm Electronics with respect to the accuracy and/or use of any products or information
described in this document. Elm Electronics will not be responsible for any patent infringements arising from the use of these
products or information, and does not authorize or warrant the use of any Elm Electronics product in life support devices and/or
systems. Elm Electronics reserves the right to make changes to the device(s) described in this document in order to improve
reliability, function, or design.
Note: all dimensions shown are in mm.
2.54
ELM327P
max
10.92
7.24
7.50
ELM327SM
10.30
1.27
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