How To Change Com Port Windows 10

One pesky problem with Windows 10, as well as the earlier versions of the Microsoft Windows operating system, is that the COM port assignments for devices that use them, frequently alter.  In this post, we show how to change COM port number on USB modem dorsum to what it was before. Or, you can do this to changed assigned port number at will to any unused port y'all want.

A USB modem for instance, may get-go off being assigned to COM3 when you lot plug information technology in right out of the box.  Merely that assignment can (and oftentimes does) change to COM4 or some other COM port, any time the modem is unplugged and reconnected, the estimator restarts, a new version of a device driver is installed, a different USB port is used, sure Windows updates are installed, and a myriad of other possible port reassignment triggers.

Of course, when the modem COM port changes, any program that relies on the modem listening on the original COM port, no longer functions correctly.  The solution is to modify the modem COM port back to the one it was originally using, and the procedure below demonstrates how to practice this.

How to Change COM Port on USB Modem, Windows 10

1. Plug USB Modem into Working USB Port on Windows 10 Computer

You won't be able to modify its COM port settings if it's non continued to your automobile when you endeavour.

ii . Bring upwardly Device Manager  Window

You can discover Device Manager in Control Panel, or enter the word -Device- into Cortana'due south search box.  This brings up a link to -Device Manager- (usually the first i) in the results list.  Tap that link, and you lot'll encounter a screen like to the shot in the adjacent moving-picture show.

Windows ten Device Director screen, with the Modems entry highlighted.

3 . Find the Modems Device Grouping Item to Continue with How to Change COM Port on USB Modem

The royal arrow points at the Modems grouping in the terminal picture.

Then, tap / click the downwardly pointing pointer immediately to the left of that entry.  This expands the Modems device group, as shown in the side by side picture, revealing any modems currently connected to and operating correctly on your computer.  In this demo, we only have ane USB modem connected, as listed.

Windows 10 Device Manager screen, showing the Modems item expanded, with the desired USB modem highlighted.

4. Double Click the Entry for the Modem to Modify

In our demo hither, we're changing the COM port for the Agere Systems USB two.0 Soft Modem.  So, we double click the entry for that modem, and this brought up the Windows 10 device configuration screen for this modem, as shown next.

Agere Systems USB two.0 Soft Modem Configuration screen on Windows x, with the Avant-garde tab highlighted.

five. Then, Click / Tap the Advanced  Tab

The purple pointer points at the Advanced tab in the last picture.  The configuration window so redraws itself to show the advanced configuration options for this item modem, as shown in the side by side picture.

Agere Systems USB 2.0 Soft Modem configuration screen on Windows 10, showing the Advanced Settings tab, with the Advanced Port Settings button highlighted.

6. Tap / click the Avant-garde Port Settings  Push button to Go along with How to Change COM Port on USB Modem

The purple arrow in the last movie points at the Advanced Port Settings   button.  Doing and then brings up the -Advanced Settings for COMx- window, as shown next.  The actual COM port number that is currently assigned to the modem replaces the 10 in COMx here.  In our demo hither, this window is for COM4.  Thus, we see that our modem is currently assigned to COM4, although we wish to assign it to COM3.

Advanced COM port settings screen on Windows ten, with the COM Port Number selector command highlighted.

seven. Expand the COM Port Number  Pop-upward Philharmonic Box

Practise that past tapping / clicking the downwardly pointing arrow immediately to the right of the port number.  We've drawn a majestic pointer in the previous picture, pointing at this expander button in the previous picture.  When you expand the list, you become a consummate listing of bachelor COM ports that this modem may use, as shown in the side by side picture.

The -Advanced COM Port Settings- screen on Windows 10, showing the -COM Port Number- control, expanded, with the current COM port (COM4) highlighted in blue, and the desired COM port (COM3) pointed at by the regal arrow.

8. Tap / Click the Desired New Port number in the Listing

You may have to roll upwards or down in the list to find the port y'all want.  In our demo, we're assigning our modem to COM3.  So we tap COM3 in the listing, as shown in the previous picture, pointed at by the imperial pointer.  This so collapses the expanded port list back down to a single entry in the -COM Port Number- field, showing the new port number we chose.  Nosotros've changed our modem to COM3, every bit shown in the next movie.

Advanced COM Port Settings- screen, showing the -COM Port Number- control, changed to COM3, and the OK push button highlighted.

9. Tap / Click the OK button on the Advanced Settings for COMx  Window to Continue with How to Modify COM Port on USB Modem

Doing and then closes that window, and reveals once again the device configuration window for our modem, as shown next.

Agere Systems USB 2.0 Soft Modem configuration screen on Windows ten, with the OK push button highlighted.

x. Press the OK Button on the Device Configuration Screen

This applies the new COM port assignment to the modem, and closes that window, once over again revealing the Windows 10 Device Director window, every bit shown in the adjacent motion picture.

Device Director- screen on Windows 10, with the Go out option highlighted.

eleven. Exit the Device Manger Window

Get out either via its file->Leave menu item as shown in the previous picture, or by tapping / clicking its -Close- button, found in the top right corner of the window (the X push button).  Your COM port reassignment for the modem is now consummate.

With the COM port successfully changed, we recommend that yous shut and restart whatever program(due south) that utilize the modem, and, if necessary, alter the COM port settings in said program(s) to match the port number nosotros just ready up.

12. Done with How to Modify COM Port on USB Modem !

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References for How to Change COM Port on USB Modem

1. How to change the COM port for a USB Serial adapter on Windows seven, viii, 8.1, and 10,  from Pluggable.com

Revision History

• 2019-05-thirty: Added links and tags.
• 2019-04-27: Added tags.
• 2018-04-18: Revised post title and content for better keyword targeting.
• 2017-12-04: Originally published.

Source: https://tomstek.us/change-com-port-on-usb-modem/

Posted by: meachamhiscon.blogspot.com

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