重点研究了客户机、中心服务器和下位机之间的数据通信流程、通信帧协议及软件设计。

The flow of data communication, the protocol of communication frame and the design of software, among the guest computer, center server and the computer on the spot, are researched importantly.

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软件系统的开发是一个比较复杂的工程，涉及到的主要技术领域有网络通信、多线程技术及服务器设计等。

As a complicated system project, the development of software involves lots of relevant techniques such as network communication, multithreading, server design and so on.

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本文介绍了一个适用于经贸领域的行业EDI系统的设计及实现，对其总体结构及操作流程作了初步探讨，主要阐述了EDI通信包、EDI通信软件和EDI服务中心的设计。

This paper introduces a trade EDI system, and after discussing the architecture and operating procedure, describes the design of EDI message, EDI communication software and EDI service center.

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