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SCIA和SCIB连接不上电脑

你好!那个plc(f28069)的板子,我想用一下SCIB,线连好了,设备管理器上是com10,但我用串口调试助手打不开com10。而scia我用两头母线的串口线和电脑连接,设备管理器没有多显示端口。这大概都是什么原因呢?是不是我哪里没设置好吗?求解答。