本文件规定了除制动器和传动装置以外的设备的应用层、信息有效载荷和参数组，以确保最大授权总质量大于3500 kg的道路车辆及其牵引车辆之间的数字信息交换，包括牵引车辆之间的通信。 本文档支持对象检测（OD）的参数和消息集。在被牵引车辆上安装符合本文件要求的物体检测（OD）装置时，会显示一条专用信息。 此外，还指定了一些照明参数和信息。 一致性和互操作性测试计划不属于本文件的一部分。

This document specifies the application layer, the payload of messages, and parameter groups for equipment other than brakes and running gears, to ensure the interchange of digital information between road vehicles with a maximum authorized total mass greater than 3？500？kg and their towed vehicles, including communication between towed vehicles. This document supports the parameters and message sets for object detection (OD). The installation of the object detection (OD) device compliant to this document in the towed vehicle is identified by a dedicated message. Additionally, some lighting parameters and messages are specified. The conformance and interoperability test plans are not part of this document.