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MAX3221通信乱码问题

我使用是的MAX3221IPWR(TI的货,不是美信的),电压是3.3V(4.7uF + 0.1uF),四个电容(C1、C2、C3和C4)放0.1uF,在通信的时候,RS232转TTL没问题,但TTL转RS232就输出乱码了(不是我发送的数据),单片机和PC机通信,PC机用USB转串口线(CH340芯片)。电路图如附件中

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