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针对高速公路外场设备种类繁多，底层协议复杂的问题，在分析了智能交通的通信协议架构以及外场设备与中心数据现有的交互模式的基础上，提出了基于原语的数据交互的协议架构，并对原语的主体以及原语的封装进行了描述，定义了外场设备的相关单元标示符. 以摄像机为例，描述了其应用服务数据单元的构成，统一了原语的数据格式与通信规约，规范了区域联网的监控数据和远程控制外场设备的监控命令，最终给出了系统的总体框架，搭建了完整的外场设备控制平台，完成了摄像机与中心基于原语的数据交互. 屏蔽了底层设备接口细节，实现了监控应用系统的透明.

Monitoring Data Exchange of Highway External Field Equipments Based on Primitives

Aiming at various external field equipments and the complex bottom protocol of highway, based on analyzing the intelligent transport communication protocol architecture and existing data exchange mode, the protocol architecture of data exchange based on primitives is proposed. We describe the subject and the package of primitives, and define the identifier of relevant unit of external field equipments. Taking the camera as an illustration, we describe the composing of application service data unit, unite data format and communication statute, and standardize the monitoring date of region networking and the monitoring command of romote conreol external field equipments, then provide the overall framework of system, and set up a complete control platform for external field equipments. The platform completes the data exchange and shields the bottom device interface details, so the monitor application system is transparent.