This paper introduces a power transmission line microcomputer distance protective device based on RS-232 and RS-485 bus, and elaborates the design method of software and hardware for serial communication.

• 本文介绍了一种基于RS-232总线和RS-485总线的电力线路微机距离保护装置,文中重点阐述了串行通信软、硬件的设计方法。