612699
1
Zoom out
Zoom in
Previous page
1/94
Next page
ELM327
Elm Electronics – Circuits for the Hobbyist
www.elmelectronics.com
OBD to RS232 Interpreter
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.
Power Control with standby mode
Universal serial (RS232) interface
Automatically searches for protocols
Fully configurable with AT commands
Low power CMOS design
Diagnostic trouble code readers
Automotive scan tools
Teaching aids
Description
Applications
Block Diagram
Features
1 of 94
Connection Diagram
PDIP and SOIC
(top view)
OBD Tx LED
OBD Rx LED
RS232 Tx LED
RS232 Rx LED
CAN Rx
CAN Tx
ISO L
ISO K
VDD
RS232 Rx
RS232 Tx
PwrCtrl / Busy
IgnMon / RTS
MCLR
Memory
Baud Rate
LFmode
J1850 Volts
XT1
XT2
VSS
ISO In
PWM In
J1850 Bus+
VPW In
J1850 Bus-
Vmeasure
VSS
18
17
Command
and
Protocol
Interpreter
6
RS232Tx
RS232Rx
LFmode
RS232
Interface
2
7
ISO 15765-4
SAE J1939
ISO 9141-2
ISO 14230-4
SAE J1850
PWM & VPW
24
23
A/D
Converter
15
16
Baud Rate
5
Memory
OBD interfaces
1
PwrCtrl / Busy
12
22
21
11
13
4
3
14
4.00 MHz
9
10
XT1 XT2
MCLR
Vmeasure
IgnMon / RTS
26
27
status LEDs
25
28
Power
Control
ELM327DSJ
1


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for Elm 327 at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of Elm 327 in the language / languages: English as an attachment in your email.

The manual is 0,23 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info