之前我下载了488.2，并成功连接上了我的设备，并且还用labview控制过我的设备了。但有时候软件卡住，我就重新插拔过几次usb头。
然后突然就开始连接不了了，gpib的提示灯也不亮了，或者插进去亮几秒就熄灭。用设备管理器发现它提示有警告信息（如图所示）。但在此区间我并没有更换过驱动。（不知道会不会因为我用matlab的instrument control 给gpib发了一条reset指令有关？或者是和我插拔了几次usb头有关？）
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