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MSP430FR5739开发板串口连接不上



我买了FR5739的开发板套件包括cc3000模块,在测试的时候发现,usb接到pc上串口经常链接不上,有时候又能链接上,请问这是什么?

我的pc操作系统是win8.1,64位。

设备管理器中看到MSP430 Application URAT(com1) 是正常的