该文档主要介绍了一种GPS定位终端设备所采用的通信协议-天琴协议，里面详细介绍了有关天琴协议解析的具体说明，是从事GPS/BDS车辆监控管理系统开发的重要参考资料。(This document mainly introduces a communication protocol used in GPS positioning terminal equipment, the Tianqin protocol. It details the specific explanation of the Tianqin protocol analysis. It is an important reference for the development of GPS/BDS vehicle monitoring and management system)