摘要： 分析了基于UART 总线型拓扑的可靠性连接和单主多从、令牌、多主对等系统的实现方案。从3 个方面研究了通信性能，UART的接口与传输线特性决定了系统的最高通信速率；基于UART 位串时槽研究了重新校准波特率的最大时间；基本UART 的协议相关分析表明，衡量通信效果应从协议的效率、传输线的“忙闲”程度、数据理解率和时态特性几个方面分析。

关键词: UART；可靠通信；通信性能

Abstract: To establish a reliable UART-based bus network, some connection proposals are presented and analyzed. Three alternatives of the bus topology are given to establish the communication. Communication performance is individually researched from three aspects. UART’s interface and wire properties determine the highest baudrate. The transmission-related analysis shows that the baudrate-recalibrated time is determined by two aspects that are the inter-slot condition and the intra-slot condition. The protocol-related analysis shows that the communication effect is scaled by four aspects, which are start-stop protocol efficiency, wire’s “busy/idle”, data understanding rate, temporal characteristics

Key words: UART; Reliable communication; Communication performance