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ELM327SM Datasheet(PDF) 1 Page - ELM Electronics |
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ELM327SM Datasheet(HTML) 1 Page - ELM Electronics |
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1 / 76 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 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 reduce power consumption. • Power Control with standby mode • RS232 baud rates to 500 kbps • 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 76 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 ELM327DSH |
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Similar Description - ELM327SM |
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