并给出了系统组成框图和程序流程图，在分析、处理随机信号逻辑关系的基础上，提出了PLC的编程方法。
The system composition block diagram and program flow of charts are presented. After analyzing and processing the logical relationship of stochastic signal, the way of PLC program is put forward.
介绍一种以80c51单片机为核心的航向信号测试系统，给出了系统的硬件组成、工作原理和软件流程图。
A measuring system for course heading signal based on 80c51 was introduced. The hardware and software of the system were presented.
介绍一种基于电话网且采用MT8888作DT MF信号的收发器件的报警系统，文中给出了MT 8888与电话线的接口电路及软件流程图。
This paper provides a warning system, it use DTMF signal of telephone and MT8888 as a monolithic DTMF transceiver with call progress. It also gives the hardware and software flow chart of the system.
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