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SFRA软件串口连接后提示NODATA

Other Parts Discussed in Thread: SFRA, MAX232

我用SFRA软件连接普通的28035板子,界面显示已连接,但界面上的start sweep按钮还是无效,按钮下边提示no data,下面的显示均无效。把区域和语言也改为英语了,还是不管用,有碰到过此问题的吗,或者说必须要在正式电源控制板有电压输出的情况下才能正常工作?