微机串行通信的电流环路实现方案

Realization of Computer Serial Communication Using Current Loop

简述了微型计算机串行通信中 2 0 m A电流环方式较之电平驱动方式的优点 ,提出了一种基于通用串行接口实现电流环方式通信的设计方案。设计了合理的接线图和电路原理图 ,并就有关电路设置、工作原理进行了详细说明。

The advantages of 20 mA current loop in computer serial communication are described. A scheme to realize serial communication using current loop is presented, which is based on universal serial interface. In this scheme, reasonable interface charts and circuit schematics are designed, and the principle of the circuit and its settings are explained in detail.