Change Usb Serial Number

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Starting in Windows 10, Usbser.sys supports USB Selective Suspend. It allows the attached USB-to-serial device to enter a low power state when not in use, while the system remains in the S0 state. When communication with the device resumes, the device can leave the. . Enter USB. Mandatory entry mechanism for USB4 on Ports and Cables. May also be used to enter USB 3.2 and USB 2.0 operation. Data Reset. Means to reset the USB data connection between PD Ports. Resets the cable by power cycling VCONN. Does not affect the power contract or data/power roles. USB serial numbers are optional for all other device classes. However, if you implement the serial- number feature, all devices of the same model must have unique serial numbers. If you implement the serial- number feature, the test setup requires two identical devices that have different serial numbers in order to pass the test. However, after rebooting the Windows with the two USB devices attached, the COM port assignment should be decided by Windows for the two USB devices with same VID, PID and serial number. Mark Hi Mark, I'm having issues with comports after the latest Windows 10 update.

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, often change. In this post, we show how to change COM port number on USB modem back to what it was before. Or, you can do this to changed assigned port number at will to any unused port you desire.

A USB modem for example, may start off being assigned to COM3 when you plug it in right out of the box. But that assignment can (and often does) change to COM4 or some other COM port, any time the modem is unplugged and reconnected, the computer restarts, a new version of a device driver is installed, a different USB port is used, certain 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 change the modem COM port back to the one it was originally using, and the procedure below demonstrates how to do 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 change its COM port settings if it’s not connected to your machine when you try.

2. Bring up Device Manager Window

You can find Device Manager in Control Panel, or enter the word -Device- into Cortana’s search box. This brings up a link to -Device Manager- (usually the first one) in the results list. Tap that link, and you’ll see a screen similar to the shot in the next picture.

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

The purple arrow points at the Modems group in the last picture.

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

4. Double Click the Entry for the Modem to Change

In our demo here, we’re changing the COM port for the Agere Systems USB 2.0 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.


5. Then, Click / Tap the Advanced Tab

The purple arrow points at the Advanced tab in the last picture. The configuration window then redraws itself to show the advanced configuration options for this particular modem, as shown in the next picture.

6. Tap / click the Advanced Port Settings Button to Continue with How to Change COM Port on USB Modem

The purple arrow in the last picture points at the Advanced Port Settings button. Doing so 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 x in COMx here. In our demo here, this window is for COM4. Thus, we see that our modem is currently assigned to COM4, although we wish to assign it to COM3.

7. Expand the COM Port Number Pop-up Combo Box

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Do that by tapping / clicking the downward pointing arrow immediately to the right of the port number. We’ve drawn a purple arrow in the previous picture, pointing at this expander button in the previous picture. When you expand the list, you get a complete list of available COM ports that this modem may use, as shown in the next picture.

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

You may have to scroll up or down in the list to find the port you want. In our demo, we’re assigning our modem to COM3. So we tap COM3 in the list, as shown in the previous picture, pointed at by the purple arrow. This then collapses the expanded port list back down to a single entry in the -COM Port Number- field, showing the new port number we chose. We’ve changed our modem to COM3, as shown in the next picture.

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

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


10. Press the OK Button on the Device Configuration Screen

Change Usb Serial Port Number

This applies the new COM port assignment to the modem, and closes that window, once again revealing the Windows 10 Device Manager window, as shown in the next picture.

Usb Serial Number Find

11. Exit the Device Manger Window

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Exit either via its file->Exit 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 button). Your COM port reassignment for the modem is now complete.

With the COM port successfully changed, we recommend that you close and restart any program(s) that use the modem, and, if necessary, change the COM port settings in said program(s) to match the port number we just set up.

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

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Revision History

  • 2019-05-30: 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.

If you have a serial touchmonitor and your computer system only has a USB port, there are two methods to solve this problem.

The best solution is to purchase an add-in serial port card; they are offered in a range of prices and quality and can be purchased from several vendors. When purchasing an add-in serial port card, we recommend that the serial ports be true UART (Universal Asynchronous Receiver Transmitter) devices. Typically this will be denoted in the product specification as a UART 16550. Beware of products that claim UART compatible or 16550 compatible.

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Another solution is to use a USB to serial converter to add serial ports to a system, but we have found that the majority of these devices do not function well with a data-intensive device such as an Elo touchmonitor. Some USB to serial converters simply do not work with Elo touchmonitors; others may work with Windows 2000 and XP but not with earlier operating systems (or vice versa). We have also found that models and availability are constantly changing. Elo does not recommend using USB to serial adaptors with its products, and cannot offer technical support if such devices are used.

When using a USB to serial converter, you must use the serial touchscreen driver; serial drivers are available on the Driver and File Downloads page.

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