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一、问题的提出以Z80为CPU的单板微型机目前在工业控制和监测方面得到广泛的应用。实际生产中的控制情况及监测结果往往要由前级单板机送到后一级的微型计算机系统,做进一步的数据处理,或作历史资料存盘;或打印出一系列的报表和图形,以供指导生产之用。前级机的数量多于一台时,就形成了所谓的两级分布式系统。凡是两级系统,必须要解决前级机与后位机的数据通讯问题。
First, the issue put forward to Z80 single-chip microcomputer CPU is currently in industrial control and monitoring has been widely used. The actual situation of production control and monitoring results are often sent to the former level after the single-chip microcomputer system, for further data processing, or save historical data; or print out a series of reports and graphics to For guidance of production purposes. When the number of front-end machines is more than one, a so-called two-level distributed system is formed. Any two-tier system, must be solved before the machine and the post-bit data communication problems.