Quatech USB to RS-232/422/485 Isolated Converter SSU2-400I - Manual (Page 20)

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B. Choose “Device Manager” and click “Ports(COM & LPT)” in
Device Manager
Click “Device Manager” item, all devices of computer will be list on right
site of screen and then click “Ports (COM & LPT) item for looking for more
COM devices.
C. Detail parameters of CP210x USB to UART Bridge Controller
Click “CP210x USB to UART Bridge Controller” for getting more detail
information of the device.