JLCooper 4/100 USB FaderMaster - Manual (Page 18)

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2. Look for the item “USB Serial Port”. There will be a COM
port next to it. This is the COM port associated with your
FaderMaster 4/100. You will use this to specify which
COM port your application will use to access the
FaderMaster 4/100. Close the Device Manager.
Note: You can change the COM port by opening the
properties window of this device.