论文第二章通过对各种可以实施的方案的优缺点进行分析与比较，从而确定了网络方案，串行通讯方案，数据库方案，查询模式的确定。
The second of the paper analyzed and compare with the several schemes, conformed network scheme, bunch communication scheme, database scheme, and conformed query mode.
介绍了一种基于嵌入式网关的串行接口通讯的设计方案。
This paper introduces a design scheme of a serial port communication technology based on embedded gateway.
本文阐述了主从式多机通讯的原理，提出了一种基于RS-422串行通信接口的方案和软件设计方法。
This paper describes the principle of multicomputer communication, and also the hardware and software implementation method based on RS-422 bus is given.
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