ELM327
Error Messages and Alerts (continued)
STOPPED (continued)
UNABLE TO CONNECT
has interrupted the ELM327. Most people see it
because they have not waited for pin 15 to go high, or
for the prompt character (‘>’) to be displayed before
starting to send the next command.
Note that short duration pulses on pin 15 may
cause the STOPPED message to be displayed, but
may not be of sufficient duration to cause a switch to
Low Power operation.
If you see this message, it means that 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.
If you are sure that your vehicle uses an OBDII
protocol, then 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:
ELM327P
2.54
7.24
max
10.92
ELM327SM
Package Drawings and Dimens ions Specification,
(document name en012702.pdf - 7.5MB).
Go to www.microchip.com, select ‘Design Support’
then ‘Documentation’ then ‘Packaging Specifications’,
or go directly to www.microchip.com/packaging
1.27
7.50
10.30
PIC18F2480/2580/4480/4580 Data Sheet,
(document name 39637d.pdf - 8.0MB).
Go to www.microchip.com, select ‘Design Support’
then ‘Documentation’ then ‘Data Sheets, and search
for 18F2480.
Note: all dimensions shown are in mm.
ELM327 is a registered trademark of Elm Electronics Inc.
All rights reserved. Copyright 2005 to 2013 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.
ELM327DSI
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