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你好：
在用C2PROG对TMS28069进行串口下载程序时，采用RS232（全双工串口）接口进行下载时，程序能够正确下载。
但是当采用RS485（半双工串口）时，程序无法下载，请问怎么回事啊！必须要全双工吗？
应该是涉及到收发切换的问题，建议将485电路设计为自收发模式
