本文采用常用的MAX232 等芯片设计了多速率429 总线数据发送模块。在此基础上，以AVR 单片机ATmega128 为核心，研制了一种手持式多速率429 总线测试仪。该测试仪具有功耗低，体积小，重量轻，携带方便，操作方便等特点，并可以实现429 总线数据和串口(RS232)数据相互转换。关键词：AVR 单片机 ATmega128 429 总线 总线测试Abstract: A multi-bit rates module for sending data through 429 Databus was designed by using the common MAX232 and other chips. Based on that, a handhold 429 Databus Analyzer was designed with AVR MCU ATmega128. The features of the Analyzer are low power, small cubage, light weight, easy carried, easy operation, etc. It can also exchange data from 429 Databus to RS232 Port.Key words: AVR MCU ATmega128 429 Databus Databus Test
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