Citation link:
Authors:
Dzhelekarski, Peter; Alexiev, Dimitar Serafimov
Title:
Smart OBDII interface adapter
Date of Issue:
2006
Is Part of:
Proceedings of the Technical University – Sofia, 56(2), 2006, pp. 260-265
Publisher:
TU - Sofia
Identifiers:
1311-0829 [issn]
Type:
Article
Language:
eng
Subject:
OBD; scan tool; interface adapter; K-Line; CAN
Abstract:
The vehicle on-board diagnostics system (OBDII) provides a serial diagnostic link for communication with scan tools. There are 4 diagnostic interfaces: ISO 9141-2, KWP 2000, SAE J1850 and ISO 15765. A PC-based scan tool consists of an interface adapter and specialized diagnostic software. This paper presents the implementation of a smart OBDII interface adapter. The adapter is build of a protocol converter, interface transceivers and protective devices. The full schematic circuit of the adapter is presented and explained in detail. The protocol converter (MCU) processes and transfers diagnostic messages. It communicates with PC via serial port using ASCII messages. The software for the protocol converter has been developed in C language. A state diagram of software is presented. The functions performed by the software for different interfaces are explained in detail. The adapter is successfully verified in practice.
Description:
Reviewer prof. Marin Marinov. - Formulas, tables, schemes - References, pp. 265
