介绍了微机全双工异步通讯技术在小型变电站调度自动化控制方面的应用：包括串行通讯设计原理与组成；利用汇编语言实现的程序主框图以及各子程序的主要功能。 The application of microcomputer full-duplex asynchronous communication technology in the automation control of small-scale substation is introduced. The principle and composition of serial communication design are introduced. The main block diagram and the main functions of each subroutine are realized by using assembly language.