Serial Port Used By Another Application
How do I clean-up these in-use COM ports?The COM port numbers always seem to be taken up by something and although right now I only have 4 serial ports (3 over Bluetooth and one USB to RS-232), I have numerous COM ports set as in use. I'd like to clean that list up a bit.Also it seems to me that from time to time, one of the taken COM ports gets freed up and then one of the devices I use will take that number creating confusion, since I'll have to go and hunt its com number in device manager.UPDATE:Well I just cleaned up countless USB devices that once were connected to the computer using USBDeview and still the problem still remains. I found a useful answer at.
How Do You Find Out What Is Using A Com Port?
Serial Port Reader (Serial Port Monitor) is a powerful and user-friendly serial data recorder that gives you the capacity to begin reading any serial port in a system at any time, even if the port is already in use by another application.
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Click start → Run → type regedit and click OK button. Navigate to HKEYLOCALMACHINESYSTEMCurrentControlSetControlCOM Name Arbiter. Now on the right panel, you can see the key ComDB. Right-click it and click modify.
In value Data section select all and delete reset to zero ( 0)Its 32 bytes with 8 bits in each byte in hexadecimal representation. A bit of value 1 makes a port number (1.256) reserved. The first 8 ports are in two leftmost hexadecimal values, bits ascending from lowest to highest right to left, the next 8 ports are in the second two and so on: hex F3 24 would be binary 1111 0011 0010 0100, which means that following ports are used: 1, 2, 5, 6, 7, 8 ( 1111 0011) and 11, 14 ( 0010 0100).
Com Port Registry Settings
Close the registry editor and then restart your computer. If you set the value to 0 all COM ports are free.You may need to reinstall any USB-to-serial converter. Thanks for all the advice above. I wrote software to automatically clean up the Registry but though it did adjust the Hardware, Software, and Arbiter sections it did NOT remove the phantom COM port entries.
Even a reboot with the 'USB to 2Serial Port' device removed did not clean up the system properly.However, the instructions on this did work correctly:For Win7, I adjusted the instructions slightly on that PDF to be:. click Start / (right click:) Computer / Properties / Advanced System Settings (not Device Manager). Click Environment Variables. Click in the System variables (bottom section) click New. Enter Variable Name: DEVMGRSHOWNONPRESENTDEVICESEnter Variable Value: 1. Click OK (exits Environment).Click OK (exits System Properties).Click Start. For those who do not want to use the CMD line interface I use this in Windows 7.
Open Control Panel. Select 'SYSTEM' from the menu.
Select 'ADVANCED SYSTEM SETTINGS' on the left. Select 'ENVIRONMENT VARIABLES' on the bottom right of the box. Look for 'DEVMGRSHOWNONPRESENTDEVICES' in the System Variableslist. If it is not there create it and assign it a variable value of. Back out with OK, OK, OK. You are now back in the Control panel screen.
Select 'Device Manager' and go to 'View'. Select 'Show Hidden Devices' and all hidden devices including theComm ports will be shown greyed out or Ghosted. Select the ones you want to remove, right click and select'Uninstall'.