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我做MBUS总线时，msp430通过tss721a与主机通信时，第一次主机发送指令后能正常应答，以后应答指令时msp430通过tss721a向主机发送数据在发送字节前会多出两个0x00。不通过TSS721A转换直接用232完全没问题。
