针对工程实际中常见的线状分布测点，提出了一种基于单片机的三线制组网方法。定义了测点的待机、活动、透传三个状态及其切换协议，使得主机可以通过处于透传状态的测点，直接与活动测点通信。测点间只用一根通信线，组网协议灵活，连接简单，传输距离远，还可以兼顾模拟信号的传送。用倾角传感器做实例，说明了该方法的原理以及硬件、软件实现，分析了影响传送距离的因素并提出了对策。%According to the common linear distributed measure points in engineer practice,a three-wire networking method based on SCM is proposed,which defined three states for the measuring point including standby,activities,digital transparent transmission and the switching protocol,thus the host computer can communicate with the activity measuring point directly by the transparent transmission point. Only one line of communication is used between measure points,and the network protocol is flexible,the connection simple,the transmission distance is far,and the analog signal can also be transmitted. The angle sensor is adopted as an example to illustrated the principle of the method and the hardware,software implementation. The factors affecting the transmission distance are analyzed and the corresponding measures are put forward.
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