Datasheet > ELM327_13

ELM327_13

更新时间： 2024-02-24 19:27:27

品牌	Logo	应用领域
ELM		/
页数	文件大小	规格书
82页	393K
描述
OBD to RS232 Interpreter

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ELM327_13 数据手册

ELM327

OBD to RS232 Interpreter

Description

Features

Almost all of the automobiles produced today

• Power Control with standby mode

• Universal serial (RS232) interface

• Automatically searches for protocols

• Fully configurable with AT commands

• Low power CMOS design

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.

Connection Diagram

PDIP and SOIC

(top view)

MCLR

Vmeasure

J1850 Volts

J1850 Bus+

Memory

Baud Rate

LFmode

VSS

OBD Tx LED

OBD Rx LED

RS232 Tx LED

RS232 Rx LED

CAN Rx

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.

CAN Tx

ISO L

ISO K

XT1

VDD

XT2

VSS

Applications

VPW In

RS232 Rx

RS232 Tx

PwrCtrl / Busy

IgnMon / RTS

• Diagnostic trouble code readers

• Automotive scan tools

• Teaching aids

ISO In

PWM In

J1850 Bus-

Block Diagram

4.00 MHz

Memory

MCLR

Baud Rate

LFmode

XT1

XT2

Vmeasure

A/D

Converter

RS232Rx

RS232

Interface

Command

and

RS232Tx

Protocol

Interpreter

ISO 15765-4

SAE J1939

ISO 9141-2

ISO 14230-4

SAE J1850

PWM & VPW

PwrCtrl / Busy

IgnMon / RTS

Power

Control

23 24

21 22 12

14 13 11

25 26 27 28

OBD interfaces

status LEDs

ELM327DSI

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