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How to clear the occupied COM / serial port in windows and reset the port number?

How to clear Win7 Occupied in COM mouth A serial port , Reset port number ?

Long term use of computers , The port number will be used more and more , How to solve this problem ?
WIN7 The actual test of the system is useful :
1、 Open registry editor : Start — function :regedit Or search directly to open regedit.exe
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2、 Get into HKEY_LOCAL_MACHINE -> SYSTEM -> CurrentControlSet -> Control -> COM Name Arbiter
3、 hold ComDB Just delete the file , No need to restart , Re insert the device , Port number recalculation
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