Tcp / Ip Network-based Embedded Systems

As an important instrument to record data, paperless recorder is used in many kinds of industry fields widly. 21 st centery is the network world, Internet changed our life and work completely. But now ,most of the recorder systems are still used lonely, the single MPU as the core of the system, it can relize some functions when worked together with the devices for check, servo, indication, control. Maybe we can use RS-232 or RS-485 bus and so on to make the MPUs into a special net, but the radius of the net is limited, the protocols of communication are not enough, and the net is not correlative with Internet. Embedded equipment such as paperless recorder connected to Internet can be benefited from:The embedded equipment to Internet needn't the special communication line , we can reach anywhere through the Internet line.Communication protocols is ready and open, any the equipment can be the part of the Internet by TCP/IP protocols.Informations from the network is rich,the Real-time data can be updated automaticly, the operations for the equipment can be fed back in time .When the user get the data, can display and operation the data freely .for example ,the executor can watch and control;the manager can change the run mode and execute some important decisions.To connect PC to Internet has been relized, then connect the industry field equipment to Internet is the trend for the future , the Ethernet has a wonderful future.The paper can be devided into 8 chapters to explain how to control the paperless recorders with the TCP/IP net.Chapter one is exordium, it introduces the concept for embedded system, ethernet for control, the development of the industry control and the developmentof the paperless recorder, to show several methods to connect the embedded system to Internet. At the same time we also introduced simply the background for the task, the content and structure for the paper.Chapter two introduced the key technic: TCP/IP protocols. The protocols are defined according to the layers of the network, so we must know the layers structure for the network and the protocol in every layer, then explains the the concept for the embedded TCP/IP protocols, last we explains particularly why we used UDP but not TCP.Chapter three shows the hardware structure for the TCP/IP network interface embedded system,it includs the MCU 89C52, NIC RTL8019AS, impulse transformer FC22, in the last we get a whole hardware structure chart. Chapter four introduced the software design of the system for the chapter three.Chapter five is mainly the program of PC, it include two parts:one for the connect PC to TCP/IP net with Socket program, and realized the communication between PC and 89C52 for the network interface system;the other is the deal with the data,and saved it.Chapter six introduces the communication between the network interface system and the paperless recorder, and the communication protocols for the three parts:PC, the network interface system and paperless recorder.Chapter seven, facing the new technic, we discussed a new method to connect the network with ARM embedded processor and embedded operation system -uC/OSH.Chapter eight is the conclusion and prospect.In the future the Ethernet will be the standard for Fieldbus.