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一、引言计算机在各个领域中的应用日益广泛,各种信息处理系统都应运而生.办公自动化、工业控制自动化等都需要各种计算机相联,如联机系统、计算机网络、局部网络以及由多台单板机构成的数据采集系统等.在设计、开发这类系统时,常常会遇到这样的问题:网络上的信息流是怎样的?它们的协议是怎样的?两结点之间的应答关系如何?如果发出这样一帧,对方会怎样应答?等等.特别是在现有系统的基础上扩充新系统或分析国外先进的产品时,这种问题就更突出了.此时不仅要知道信息流如何,而且还要有一定的
I. INTRODUCTION Computer is widely used in various fields and all kinds of information processing systems come into being.Office automation and industrial control automation need all kinds of computer association, such as online system, computer network, local network, Taiwan veneer machine into a data acquisition system, etc. In the design and development of such systems, often encounter such problems: What is the flow of information on the network? What is their agreement? Between the two nodes What is the response relationship? If so, how would the other party respond? Etc. The problem is especially acute when new systems are being added or advanced foreign products are being developed on the basis of existing systems. Know how the flow of information, but also have some