ELM327

All ELM327 chipped scan tools support the Elm AT command AT@1

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 Connection Diagram provides support for high speed communications, a PDIP and SOI Clow power sleep mode, and the J1939 truck and bus (top view) standard. It is also completely customizable, should you wish to alter it to more closely suit your needs.

Applications 

--> Diagnostic trouble code readers 

--> Automotive scan tools 

--> Teaching aids

ELM327 Overview
     

The following describes how to use the ELM327 to features of this integrated circuit as well. obtain information from your vehicle. Using the ELM 327 is not as daunting as it first. 

We begin by discussing just how to ‘talk’ to the ICseems. Many users will never need to issue an ‘AT’ using a PC, then explain how to change options using command, adjust timeouts, or change the headers. For ‘AT’ commands, and finally we show how to use the most, all that is required is a PC or smart device with a ELM 327 to obtain trouble codes (and reset them). 

For terminal program (such as HyperTerminal or ZTerm), the more advanced experimenters, there are also and a little knowledge of OBD commands, which we sections on how to use some of the programmable will provide in the following sections… 

Communicating with the ELM327 

The ELM327 expects to communicate with a PC are correct (however, at this point no communications through an RS232 serial connection. Although modern have taken place with the vehicle, so the state of that computers do not usually provide a serial connection is still unknown). 

Such as this, there are several ways in which a ‘virtual The ‘>’ character that is shown on the second line serial port’ can be created. The most common devices is the ELM327’s prompt character. It indicates that the are USB to RS232 adapters, but there are several device is in the idle state, ready to receive characters others such as PC cards, Ethernet devices, or    on the RS232 port. 

If you did not see the identification Bluetooth to serial adapters. String, you might try resetting the IC again with the AT No matter how you physically connect to the Z (reset) command. Simply type the letters A T and Z ELM327, you will need a way to send and receive (spaces are optional), then press the return key: data. The simplest method is to use one of the many 

OBD works with any Elm327 chipped scan tool or any scan tool powered by a chip that fully emulates all the AT commands of the Elm327 chip. There are many manufacturers of ELM 327 chipped scan tools, so theoretically we support any scan tool powered by an Elm327 chip. 

However, we directly support the scan tools you see on our main page, because these companies have proved to both reliable and supportive. We are confident in recommending any of these scan tools because we have observed the quality of the products and can vouch that these scan tools are all made to the highest standards. We have also extensively tested each of these products with OBD. 

We have created a table of features comparing each of the scan tools we directly support. If you are new to OBDII scan tools or even an experienced user considering an additional scan tool, we hope the following table will highlight the various features of each scan tool to assist in your decision making. 

OBDPro 

Without doubt this scan tool is the “Rolls Royce” of the Elm327 scan tools. The OBDPro scan tool is jammed packed full of innovative features as compared to the other Elm327 scan tools. 

Specifically where the OBDPro shines is with the following 3 unique features 

--> Support for very high speed baud rates. 

--> Double buffered message queue. 

--> Remote upgrade capability. 

--> High Speed Baud Rates and Double Buffering 

The first two features are primarily aimed at the high speed CAN protocol, the protocol used by all new vehicles manufactured since 2008. When the CAN protocol was first introduced in vehicles during 2004/05, many ELM 327 chipped scan tools suffered from BUFFER FULL messages, as a result of the high speed CAN networks of the vehicle over running the small internal buffer of the Elm327 chip. The OBDPro scan tool, overcame this limitation with its unique double buffer design, so that BUFFER FULL messages were eliminated even at low speed baud rates. 

However, why use slow baud rates (9600 and 38,400 baud), when a USB port is capable of speeds of up to 2.0Mbits. The OBDPro scan tool in conjunction with OBD 2007 can exploit the very high speed baud rates of the OBDPro scan tool up to 4 times faster than the current Elm327 v1.3 chip. If you are seeking high speed performance, then the combination of OBDPro and OBD is the obvious choice. 

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