At period of experiment, the correctness of design is testified by using USB mouse that is belong to HID device class as like RS232->USB converter.

在实验阶段，为简化调试工作，采用与RS232->USB转换器同属HID设备类的USB接口鼠标联调的方法验证原理设计的正确性。

youdao

For USB GPRS modems, a USB-to-serial converter typically converts the USB port into a virtual serial port so the rest of the system sees it as a serial device.

针对usb GPRS调制解调器而言，USB - to - serial转换器一般us b端口转换为虚拟串行端口，因此系统其他部分就会将它看作串行设备。

youdao

The hardware of the system involves the EMG amplifier, the stimulator, the digital-analog converter, the analog-digital converter, the USB controller and the PC.

系统的硬件部分包括肌电放大器、刺激器、数-模转换部分、模-数转换部分、USB控制部分和PC机。

youdao