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bbblack 通过usb与串口的通讯

系统版本是sdk-03.02的版本。接上USB在/dev/ttyUSB*之类的设备节点。

打印出来的消息只是usb 1-1: new full-speed USB device number 4 using musb-hdrc

请问bbblack怎么通过这个USB接口与485通讯上