Research Of Data Acquisition System Based On Embedded Ethernet

Along with the wide application of Ethernet in many fields, a lot of whilom isolated equipments and systems have been joining up with it, which makes it possible that more and more information and resources can be shared. A remote data acquisition system based on the Embedded Ethernet technology supplies the shares with a physical means, and it has exigent demands and promising markets in the industrial control field. Therefore, more and more enterprises and individuals are taking up with the research.Aiming at the practical requisition in oil pipeline's leakage detection, a remote data acquisition system based on the Embedded Ethernet technology is designed in this dissertation. The system achieves eight bit MCU connection with Ethernet chip, embedded tidy TCP/IP protocol stack uIP and Real Time Opetarion SystemμC/OS-Ⅱ. While it carries out data acquisition, MCU disposes the data and makes Ethernet chip transmission the data to remote inspection system.The hardware mainly comprises six modules: signal procession module, time adjusting module, memorizer module, network control module, WDT module and power management module. The article analyzes embedded system connection with Ethernet chip and designs the circuit of electric conversion which fits the requisition of MCU. According to the character of the 8-bit MCU's limited resources, we have cut the TCP/IP protocol family(UDP, ICMP, IP, ARP etc.) and made it running on the 8-bit MCU. In order to improve the reliability and ensure the stable running of the TCP/IP protocol stack, the embedded RTOSμC/OS-Ⅱis introduced during the program designing. In the article, we have described the task scheduler mechanism of the RTOSμC/OS-Ⅱand discussed the possible problems which we can meet in transplanting OS to C8051F020, as well as how to embed the TCP/IP protocol stack inμC/OS-Ⅱin detail.On the base of the software and hardware, we have designed a network MCU data acquisition system. The article consists of the data acquisition network and the remote inspection software platform for PC. The network is built up with some embedded remote data acquisition terminals. The control functions of signal acquisition and data transmission in the terminal are programmed with C language, as well as the embedded TCP/IP protocol stacks which uphold data transmission on network. Under the development circumstance of LabVIEW, the inspection platform achieves management of remote terminals, interactive communication of network data.