本文介绍了利用AX.25 协议构成分组无线网的方案,给出了基于AX.25 协议的终端结点控制器的硬件和软件实现方法,讨论了AX.25 协议在PIC16F877 单片机上的设计与实现。 关健词:分组无线网,AX.25 协议,单片机 Realization of AX.25 Protocol At PIC16F877 MCU CUI Yu-ling,BAN Jian-min ( Electronics and Information Department, University of Science & Technology of Suzhou, Suzhou,215011) Abstract: This paper introduce a scheme of packet radio networks using the AX.25 protocol,and proposes a way to implement the hardware and software of the terminal node controller.At last, the design and implementation of terminal node controller board on PIC16F877 is discussed. Key Words: packet radio networks, AX.25 protocol, microcontroller