电力线载波通信是电力系统的一种特殊的通信方式，在对这种通信方式进行充分研究的基础上设计了一种双CPU、低功耗、低成本的数字复接器，以满足电力通信传输系统的需要。本文详细阐述了数字复接器的硬件和软件的设计原理，应用单片机仿真器进行仿真，通过调试达到了满意的效果。关键词：复接器；CPU；双口RAM；同步Abstract: The electric power carrier communication is the special communicated way ofelectrical power system , one kind of double CPU, the low power loss, the low cost digitalmultiplexer has been designed in conducted the full research to this communicated way, which is satisfied the need of the electric power correspondence transmission system . This article iselaborated the digital multiplexer’s hardware and the software principle of design in detail, carries on the simulation using the monolithic integrated circuit simulator, has achieved the satisfactory effect through the debug .Key words: multiplexer；CPU；double RAM；synchronization