由中间件完成调度中心与车载终端的通信，通过中间件对车辆信息进行了新的、统一的封装，在中间件和客户端之间采用更高层的通信协议。
The vehicle information has a new and unified encapsulation by adopting the middleware. And a higher communication protocol is adopted between the middleware and the customer terminal.
同时设计了一套中继通信协议，使终端具有中继功能。
第四章主要介绍了终端的软件流程，详细介绍了软件设计过程，给出了主要软件流程图和通信协议。
The fourth chapter mainly introduces the software flow of the monitoring terminal, then primarily presents design procedure of software, flow charts of the software and communication protocols.
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