How to Open Up a COM Port on a Computer
COM (short for "communication") ports are small ports located on the back of your computer used for attaching various input devices, such as certain types of printers. Enabling a COM port is the process of turning it on so that it will recognize connections without any further tinkering on your part. Accomplishing this means downloading a simple free tool from Microsoft, allowing you to quickly manipulate the status of the COM ports on your machine.
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Instructions
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1
Log onto Microsoft's website and download the COMdisable tool on your computer. (See Resources)
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Navigate to the "Start" menu, open the "Run" button and type "cmd" at the prompt then press "Enter." This will open a DOS command window.
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3
Type in "comdisable /list" and press "Enter" to find a numbered list of the COM ports on your computer.
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Type in "comdisable /enable X" (where X is the number of the COM port to be enabled) and press "Enter" to enable any COM port on your machine.
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Reboot your computer to complete the process.
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