Abstract: Control network is a kind of computer networks used in real-time monitoring and production process controlling.In a control network, the quantity of information transmitted is not necessarily large, but the transmission time is
required to be shortest. IPX is an internetwork package exchange protocol developed by Novell Cooperation. It is a connectionless network layer protocol, and is featured by good real-time transmission and being independent of the network and the transmission media; it can permit information exchange on a point-to-point basis as well as on a multi-point or broadcasting basis. In view of the above characteristics of control network and IPX, We developed a control network based on IPX protocol. This network is characterized by flexible networking and rapid transmission, and it can be conveniently integrated with information networks. The design of the applica-
tion software of this network is discussed.

Key words: Computer network, Control, Information