ELM322

	ELM322
	Weight: 260 g
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	Price: US $80

Specification of ELM322

The ELM322 OBDII Interface, allows you to talk to your VPW (10.4KHz J-1850 VPW) standard OBDII equipped vehicle using an RS232 serial connection. It is typically used in US cars from General Motors and some from Daimler Chrysler. It transparently converts between a VPW J-1850 data stream and standard ASCII characters, allowing trouble codes and operating parameters to be easily retrieved without the need for special software. No knowledge of data formatting, error checking, bus initiation etc. is needed either, as the ELM322 handles all of it for you. The present version of the ELM322 (v2.0) provides several programmable features that the previous versions did not offer.

Description of ELM322

Since the 1996 model year, North American automobiles have been required to provide an OBD, or On Board Diagnostics, port the connection of test equipment. Data is transferred serially between the vehicle and the external equipment using this connection, in a manner specified by the society of Automotive Engineers(SEA) standards. In addition to operating at different voltage levels, these ports also use a data format that is not compatible with the standard used for personal computers.

The ELM322 is an 8 pin ingegrated circuit that is able to change the data rate and reformat the OBD signals into easily recognized ASCII characters. This allows virtually any personal computer to communicate with an OBD equipped vehicle using oly a standard serial port and e terminal program, hobbyists can create their own custom scan tool.

This integrated circuit was designed to provide a cost-effective way for experimenters to work with an OBD system, so a few features such as RS232 handshaking, variable baud rates, etc. have not been implemented. In additon, this device is only able to communicate using the 10.4KHz J1850 VPW protocol that is commonly used in General Motors and some Daimler Chrysler vehicles.

ELM322 Application

Diagnostic trouble code readers
Automotive scan tools

ELM320 Features

Low power CMOS design
High current drive outputs-up to 25 mA
Crystal controlled for accuracy
Fully configurable using AT commands
Standard ASCII character output
High speed RS232 communications
10.4 Khz J1850 VPW protocol

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