The Design And Realization Of Embedded Power Monitoring System

With the development of communication system, the communication power supply system's capacity is bigger and its structure is more complex. The communication power supply system's reliability is very important to keep the communication system operating steadily. In order to enhance the reliability of power supply system, it's very important to monitoring the operation of power system besides of improving the power supply system. Now, monitoring nodes usually adopt RS485 serial bus to communicate with computers in field. But RS485 bus has some problems. Its baud rate is low. It's difficult to realize free communications among all nodes and the network's installation is complex. Otherwise, RS485 bus can't connect with computer directly except for transferring the protocol.As a powerful communication technology, Ethernet has been widely applied to office automation and digital business field. The traditional solutions usually use 16-bit or 32-bit microprocessor. This is exactly why they cost so much. Aiming to expanding the applications in industrial automation, apparatus automation and building automation fields, the costs of Ethernet technology applications need to be reduced, so that a brand-new and low-costs solution of embedded Ethernet system based on 8-bit microprocessor is brought forward in this thesis.This thesis analyses how to realize low cost Ethernet communication. The hardware interface circuit is described. The uC/OS-II embedded real time kernel is transplanted and two software methods about communication are also given in the thesis. This system has great flexibility. It could be connected to the traditional apparatus as an Ethernet interface. On the other hand, it could also perform as a workstation by extending peripherally circuits to accomplish a degree of data collection, storage, analysis and processing functions.At the end of this thesis, an actual system made up of with 8051 single-chip microprocessor and RTL8019AS NIC is built. The test realizes the high-speed data collection and communication successfully. It proves that the system based on Ethernet bus is feasible.