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20mA电流环串行接口以其电路简单、连接方便、抗干扰能力强等特点得到广泛应用.该文介绍了专为多点通信系统设计的基于20mA电流环技术的网络接口电路,详细讨论了其电路组成、工作原理,最后给出了在分布式微机配料控制系统中的应用实例.
20mA current loop serial interface is widely used because of its simple circuit, convenient connection and strong anti-interference ability.This paper introduces a network interface circuit based on 20mA current loop designed specifically for multi-point communication system and discusses in detail its Circuit composition, working principle, and finally gives an example of application in the distributed microcomputer control system.