ELM327DSH Datasheet | ELM

Description 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 munications, a low power sleep mode, and the J1939 truck and bus standard. It is also pletely 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. Applications - Diagnostic trouble code readers - Automotive scan tools - Teaching aids Features - Power Control with standby mode - RS232 baud rates to 500 kbps - Automatically searches for protocols - Fully configurable with AT mands - Low power CMOS design Connection Diagram PDIP and SOIC (top view) MCLR Vmeasure J1850 Volts J1850 Bus+ Memory Baud Rate LFmode VSS XT1 XT2 VPW In ISO In PWM In J1850 Bus- OBD Tx LED OBD Rx LED RS232 Tx LED RS232 Rx LED CAN Rx CAN Tx ISO L ISO K VDD VSS RS232 Rx RS232 Tx Pwr Ctrl / Busy Ign Mon / RTS Block Diagram 4.00 MHz Baud Rate 6 LFmode 7 Memory RS232Rx 18 RS232Tx 17 RS232 Interface Pwr Ctrl / Busy 16 Ign Mon / RTS 15 Power Control XT1 9 10 XT2 mand and Protocol Interpreter 25 26 27 28 status LEDs MCLR A/D Converter Vmeasure ISO 15765-4 SAE...