本文分析嵌入式設備的特點，并在此基礎上提出充分利用嵌入式設備提供的接口資源，
實現故障檢測和診斷的方法，將設備故障定位到電路板級，為板級電路的故障檢測和診斷奠定基礎。此種方法在復雜工程環境下，無需拆卸嵌入式設備即可判斷整機性能，達到故障檢測和診斷的基本要求。在這一方法基礎上，本文以某車載GPS 導航系統為被測對象，詳細介紹了故障檢測和診斷系統設計。
關鍵詞：串行通訊；嵌入式設備；故障檢測與診斷
Abstract: According to the characteristics of the embedded equipment, a fault detection and
diagnostic technique based on serial communication is put forward in the paper. This method
achieves the board-level fault detection, provides foundation for the component-level fault
detection and diagnosis, and meets the basic needs of fault detection and diagnosis without
disassemble the equipment under complex environments. Based on this method, the paper
introduces a fault detection and diagnosis system designed for the GPS navigation system.
Keyword: serial communication; embedded equipment; fault detection and diagnosis.