Design and implement of RS-485 bus fault injection

Testability is a significant design feature for system, which has gong through five stages such as External Test, BIT (Build-in Test), Intelligent BIT, Comprehensive Diagnosis and PHM (Prognostics and Health Management), has greatly improved the maintainability, reliability and availability of the modern weapons especially in electronic systems [1]. Meanwhile, in the process of the researches on systems and equipment, we need to inject faults to undertake the actual tests in the prototype, in order to verify the correctness of the testability analysis and design, identify design flaws and inspect whether the products satisfy the requirements of the testability design absolutely. Nowadays, for the complex electronic systems, the foreign researchers widely use the technology of fault injection to find the testability design flaws in the electronic systems exactly and assess the testability indexes of the systems [2]. In this paper, we have mainly researched the external-bus faults injection system for the requirement of the PHM verification tests in the position of the external-bus, designed and implemented a fault injector based on the RS-485 bus and designed a simulating experimental environment to validate the authenticity and validity of the RS-485 bus fault injector.