The Research And Application Of Field-Bus Based On Embedded System

CAN (Control Area Network) field-bus is a very safety serial bus which can support distributed real time control. CAN has been used in industrial environment and Auto-electricity widely.As developing rapidly recently, a embedded processor can make a more complex operation and data process, and the size of embedded processor is smaller, the cost of hardware is lower and lower.This system includes a node based on a embedded processor, two nodes based on micro-controller and a USB-CAN node, which linked by the CAN bus. The node based on microcontroller AT89C52 is a smart node. It simulated a automatic device, which can be controlled remotely and be programmed to run.The node base on the embedded system can detect and record the communications of CAN bus. The core of this node is ARM9-S3C2410, a 32bit processor, which has a powerful function.The node of USB-CAN is the person computer can access the can bus conveniently. Today, almost any personal computer has a usb port, so we design a usb-can node which can make the access of the CAN bus easier, make debugging and recovering industrial device faster.This project built a network of CAN, which did much work with the low protocol of CAN 2．0．For the network can work correctly, this paper did some research on the application protocol of CAN, and designed a concise and feasible application layer protocol. It succeeded in communication among every node of this system.