本文档提供了在SPA组件和系统中整合测试旁路（TB）功能的详细信息，并描述了TB的消息传递协议。测试旁路是一种机制，通过该机制，可以将测试数据注入正在运行的SPA系统，或者在集成和测试期间，可以从系统内的各个测试点提取操作数据。TB的概念是为了进一步增强SPA兼容车辆的快速组装、集成和测试（AI&T）。SPA指南中提供了关于TB功能和接口的更多一般性讨论。 本文件定义了结核病的当前实践状态。本标准适用于所有支持旁路功能的SPA设备和系统。本标准将更新该方法的进一步发展。解决测试功能的其他开发将在其他文件中定义。

This document provides detail for incorporation of Test Bypass (TB) functionality in SPA components and systems, and describes the messaging protocol for TB. Test Bypass is the mechanism by which test data may be injected into the running SPA system, or by which operational data may be extracted from various test points within the system during integration and test. The concept of TB was developed to further enhance the rapid assembly, integration, and test (AI&T) for SPA compliant vehicles. More general discussion on TB functions and interfaces is available in the SPA Guidebook.This document defines the current state of practice for TB. This standard is applicable to all SPA devices and systems that support a bypass function for testing purposes. Further development of this method will be updated within this standard. Other developments that address testing functions will be defined in other documents.