The TCP/IP protocol in network programming was introduces, the Winsock architecture was also discussed, then the developing process of communication based on Client/Server model under the environment of Visual C++ was described.

For improving the management level of laboratory,this article introduced a way of designing and implementing the remote power-supervision system based on embedded system,and according to the system s characters,TCP/IP protocol was simplified,the teaching requirement was met,and at the same time the system s compatibility is ensured.

TCP/ IPand UDP(User Dategram Protocol)are adopted in Ethernet-based communication and the imple-mentation of UDP at communication control layer and substation layer is detailed.

By combining multim edia technology and TCP/ IP based network technology with the substation autom ation,a new idea of substation multim edia automation system is proposed to realize digitized transm ission of m ultimedia information between master station and substation.

Aiming at the disadvantage of conventional bill- printing machine,and on the basis of realizing TCP / IP protocol within 8- bit SCM,the design plan of self- correcting bill- printing machine system based on Ethernet is presented.

With embedded technology being the core,combined TCP / IP,MJPEG and a series of key technologies,this system is easy and flexible to operate and improve,and costs low.

the design is based on TCP / IP technology, it communicates with PC by the network port.

Attention is paid to the construction of this sys-tem,software and the commun ication principle supported by TCP /IP.

MBUF is a notion of TCP /IP,it is widely used in embedded application area.

The feasibility of Ethernet used as the standard of fieldbus is introduced in detail,as well as the TCP /IP used in Ethernet and the ap-plication of Ethernet/IP is introduced in the paper.