485 serial communication bus based electronic Responder system Abstract: This article describes an electronic answering device design and implementation. This electronic Responder system using a PC and AT89S51 as the core, multi-machine communication technology characteristics as the basic mechanism for serial RS485 as the main means of communication architecture. It provides time control, including answer, answer in competition testing, real-time score updates and other major features, supplemented by related audio and LED status indication, the final implementation of a simple electronic Responder system prototype.

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