How to reset com ports Tumi / 11.10.202011.10.2020 How to clear or reset COM ports? How to reset COM ports? 1. Click Start - write regedit then click Enter. 2. Feb 21, · Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\COM Name Arbiter Now right panel, you can see a key ComDB right click to that key and click modify. In value Data section select all and delete reset to Zero ‘0’. Every COM port has its number from 1 to Most of the time this is not a big deal or problem unless hoow user reet to run some ancient software that has trouble working with COM-ports higher than 9. Another issue may appear ohw some specific devices take too many ports. For example, some adapters may reserve up to 30 or even more COM ports. In this article, we will show you how to do this. There are different methods of how to delete COM ports in use. Luckily, there are different apps with a decent UI you can use to work with COM ports on your computer. We will show how to use the Registry Editor to clear or reassign COM ports, but first let us focus on more user-friendly ways to delete COM ports in use. Caution : Before deleting COM ports in use, make sure to create how to reset com ports system restore point. Having a backup gives you a path back in case something goes wrong. Portz system restore point will help you to go back quickly and restore your system functionality. First, let us go through the simplest method. This will work only if rseet have a free COM port you need to reassign. This will work only if the COM port you need to use is free. Do not worry, though. You can manually delete the used COM port and reassign it for a new device. There is another way how to check which COM ports are currently in use. Although there is nothing wrong with using the Device Manager, you can check the list using it. Launch the PowerShell in Admin mode how to reset com ports paste the following command:. It is completely free, and you can download it on the official website. This utility helps you to modify registry parameter Yo simply without taking the risk to accidentally remove or edit wrong strings in the Registry Editor. If a device is not connected, hit Remove non-present devices. This will clear all assigned COM ports and make them available to assign. You can also clear the COM port manually, by unchecking a specific device from the list. You can also use a third-party tool how to reset com ports Device Cleanup Tool to remove non-present porgs and uow up occupied Cok ports. The Device Cleanup Tool is available for free from the official website. Thus, you can delete all unnecessary COM ports if you try to remove the used device, the Remove failed error appears and reassign them to different devices. Now, let us talk about the most challenging methods of how to delete COM ports in use. All is needed what is the paradigm shift the Registry Editor which is a part of every Windows installation. Caution : Backup the important data and create a system restore point. Follow how to reset com ports instruction strictly and be careful not to edit random how to reset com ports. I have tried this in Win 7 x64 and I do not see the ports that are not connected. I am using a USB to Serial adapter FTDI — virtual com and when the usb side how to book mark a page the device is connected to the computer it shows in Device Manager, when the usb side of the device is not connected to the computer is does not show in Device Manager even when using your directions. Windows Right click start menu, click device manager. After all, this is why GUIs were invented. I tested this just a few minutes ago and yes, it looks like it has changed a little bit. Got learning how to make money online working. You need to do this. Then type: start devmgmt. Then go up to view and show hidden devices. It worked! Non present devices show up with the port number assigned right next to it. Thank you Brian for sharing your wisdom! How to read a 2 rate electricity meter have over serial ports in use on my pc is there a way to uninstall several ports at 1 time? But then I booted in safe mode, and do this procedure. Thanks, this worked for me. The driver initially can up as COM All my lower number COM ports were in use so I found these instruction to clear one of the ports:. Worked like a charm, thanks! I suspected those little bastards were hiding somewhere and now I know how to find them. To those not getting it to work, you are probably not managing to set the environment variable properly step 2. Hint: You can also find the device manager in the hardware tab in the same dialog, unless you want to show off your command line ninja skills of course. Thanks, worked a treat in Windows 7 no reboot was required when I replaced my motherboard. The com ports werent working and on checking the ports in use there were twice as many as there should be. Your tip allowed me to get rid howw the old ones. For windows 7 32bit, etc, be sure you are in the Windows directory. Type: cdWindows once you are int he command prompt, then follow steps 2,4,5,6 above. Hi Brian, got a quick question…what if you uninstall all the COMs and reboot but the COM ports come back and still show that they are in use when there is nothing being shown for the device s? Is this machine a member of a domain? If so, you might try logging on as local administrator account and re-follow the steps above. How do you do it there? Ok I figured it out never mind printers, removing to get comports etc. Com Ports will not show until you connect a comport. Now the reason you have all these unused comports is because drum roll …you have plugged in a multiple USB hub get it? Then, if you want, plug the hub in and it will assign comports above the lower number one you how to reset com ports installed. Computer will remember the comports unless you remove the lower comport, no worries just repeat the process to get the right comport. Hope this works for you! Any who had the same issue? Write down the name of the port used for the connection. Click the [Ports] tab. Click [OK] to close the properties dialog box. Show all Com Port Assignments Com port settings reset to default after making changes in Device Manager. 09/08/; 2 minutes to read; D; h; v; s; In this article. This article describes an issue where the communications port (COM port) settings revert to the default when you restart the computer. Jun 04, · If you want to reset all COM ports, change the ComDB value to. ComDB’s binary value defines the list of reserved COM ports. Every bit defines the status of the corresponding port (1 to ); You can also find the list of all assigned COM ports in the Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Ports path. May 12, · How to Reset COM Port Binding Using the Registry The information about busy COM ports is stored in CommDB registry key in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\COM Name Arbiter section. Open the Registry Editor (regedit) and go to the branch mentioned above. I connect a number of serial devices via a usb hub and serial-usb connector to my laptop. I am running Windows7 64bit. I have tried looking in the device manager and display hidden devices, but no COM port information is displayed to allow me to re-set any of the COM ports. Windows always assign a COM port no like COM2, COM3 etc every time you connect a USB device like modem, mobile phone or specially serial to USB convertors to system, and this no goes on increasing as every time you connect device windows reserve that port and next time it assign new number. I searched every where in device manager , control panel no interface is available to do this in windows, then i found a nice solution for this which allow you to free all ports but for this you need to edit registry,. Now right panel , you can see a key ComDB right click to that key and click modify. Close Registry editor and then restart your computer. Note : It is always good to take back up before deleting any entry from Registry, to take back up for Com Name Arbiter, in left panel right click on COM Name Arbiter and say Export, save with some name and appropriate location. Was this reply helpful? Yes No. Sorry this didn't help. Thanks for your feedback. Choose where you want to search below Search Search the Community. Search the community and support articles Windows Windows 7 Search Community member. Any suggestions? This thread is locked. You can follow the question or vote as helpful, but you cannot reply to this thread. I have the same question Scofield Wins. I searched every where in device manager , control panel no interface is available to do this in windows, then i found a nice solution for this which allow you to free all ports but for this you need to edit registry, here are the steps which you can use to free all post. This will open a Registry editor. How satisfied are you with this reply? Thanks for your feedback, it helps us improve the site. This site in other languages x.