If we implement unique serial number and we get assigned COM port numbers. USB device and iSerialNumber. Adding Serial Ports using devcon. Windows 7. Hi,You try to use a serial port with a standard serial communications program like the Software Wedge for Windows or Hyper. Terminal and cannot get any data to go in or out the serial port. If you are certain that 1. The serial port exists and that you are connected to the correct port on the back of your computer. You are also certain that you have the correct serial communications parameters selected in the program that you are using. Devcon Exe Download' title='Devcon Exe Download' />You can use devcon. USB Serial Port COM3 3 matching devices found. You can parse this output to find out the COM port number of your desired device. SO2R config USB COM port confusion. Advanced and changed the port number to my port selection. USB. Here we show you 5 solutions to remount your USB device without having to remove it from the USB port. Raymond. CC Blog. USB device not recognized, on one. PID number for each plugged in USB device, and show the USB port number. Need For Speed Iii Game here. Microsoft devcon. The. I am writing a script which controls 3 separate microcontroller boards through a USB Serial port. How to programmatically find USB Serial port. DEVCON. exe Download via. USB and 1394. devcon listclass usb 1394. Remove all USB devices. ACPIenumerated serial port. ACPIPNP05011. Displaying USB Devices using WMI. USB flash drive when Windows report problem such as this device can run faster if plugged in a high speed port. I reprogrammed my CP2102 serial number using the setserialnumber function in the cp210xManufacturing. CP210xSetIDs. exe. You know that the cable you are using is the correct one for the device that you are trying to interface. A good test for all of the above is to try using a different serial port or even a different PC and if everything works on the other port then the problem may be that the serial port has been disabled in the BIOS setup for your computer. To cure the problem you have the following choices 1. You can run the BIOS setup on your PC and re enable the disabled serial port using its default settings. If you will not be using the modem at the same time as the COM port then this approach will probably work although it is not fully guaranteed. You. still may have a IO port conflictTo run the BIOS setup on most computers, you press a key when the computer is booting up and a setup screen will appear Usually the DEL key, but most PCs display a message on screen during the boot process e. Press F1 to enter setup. The serial port. settings are usually located in the section labeled Integrated Peripherals setup. Do not forget to save the settings when you exit the BIOS setup. In some computers the BIOS setup will allow you to select the Port Base Address and IRQ value for each of the on board serial ports. The easiest complete solution to the problem is to configure the disabled serial port to use a Port Base Address and. IRQ that does not conflict with any of the other serial ports on the PC or the modem. For example if you could configure the port to behave as COM3 base address 3. E8 and use IRQ5, you eliminate all conflicts with the other ports unless you have some other. IRQ5. 3. If you cannot use either of the above solutions then the only option left would be to enable the serial port in the BIOS setup and then either remove the modem from the system or set the jumpers on the modem to behave as a non conflicting port i. COM3. using IRQ5, etc. Most modems that are not plug play modems have jumpers specifically for this purpose. You may need to contact the manufacturer of your modem or at least refer to the users manual for the modem to configure it correctly for your system. In some cases the instructions for the jumper settings are printed directly on the modem circuit board so you may not even need a manual. Regards,Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. How to programmatically find USB Serial port assignments Its taken several days and a lot of poking around in the registry plus a bunch of experiments and web searching but I think I finally have a solution that works for me. Im posting the results here in case someone else has a similar problem. I actually found two solutions but the first one I found did not work well when I added two more boards, one of which had a different device type. Most of the USB serial links I use are implemented on a board with a microcontroller that has a built in USB. The last board I added uses a microcontroller that has no built in controller and instead uses an external FTDI chip that provides a UART to USB interface. The solution requires the ability to read the registry. Im using the Tcl programming. I assume that most other languages do as well. The approach uses the following steps 1 First, determine the current COM port assignment for the target board. This is done by opening up Device Manager and expanding the list of Ports COM LPT. This will provide a list of all serial ports currently active on the system. This can be a mix. UART based COM ports as well as virtual COM ports. If there is any question about which one the target board is, simply unplug the device and see which entry disappears and then reappears when it is plugged back in. Open regedit. exe and go to the location HKEYLOCALMACHINEHARDWAREDEVICEMAPSERIALCOMM. On the right hand side there should be a list of COM ports that matches the list seen in Device Manager. On the left hand side is the device name assigned to the. COM port.   In my case, the five devices Im looking for determined from step 1 are DeviceUSBSER0. DeviceUSBSER0. 01DeviceUSBSER0. DeviceUSBSER0. 03DeviceVCP0. Heres where things get a bit tricky. In my Tcl program I can read the registry and, using the device types listed above I can narrow down the list of all the devices listed by using a regular expression on the device name. I now have identified the device. IDs for the five boards but which is which  Okay, I can guess that VCP0 is the one that uses the FTDI chip, but as for the other four I have no clue. Fortunately, in my case, I am writing the code for each of the boards so I can imbed a unique ID value. Trackmania For Pc Full Version. Thus, I open each of the COM ports in turn and request the device to return the ID value. If the device doesnt respond or responds with the wrong value then I know its not the one Im looking for. If you do not have control over the target device where you can imbed a unique ID value, all is not lost. You know the COM port number currently assigned. Search for this ie COM2. Edit Find function in regedit. You will likely get several. The ones you will be interested in will be found in HKEYLOCALMACHINESYSTEMCurrent. Control. SetEnum. This is the starting point for your search. Under this will be several folders that look like subdirectories but are called hives. Its time. Device Manager again. This time select the COM port identified in step 1 above and either double click on it or right click and select Properties. This will bring up a window with four tabs. Select the Details tab. The menu drop down list will. USB device but the one of interest right now is the Hardware Ids. Select this and look at the path shown. The starting path should match one of the hives shown in the Enum hive above. Switch to it in regedit. In my case, Device Manager shows an initial path of USB for the four boards using a microcontroller based USB controller and a path of FTDIBUS for the one that uses the FTDI chip. Also shown in the Hardware Ids window is something that should start with. VID.   That value should match one of the values shown in the regedit. Unfortunately, there may be multiple hives that match the VID string shown in Device Manager. Arial Arabic Normal Font more. However, if you expand them, there should only be one that has a sub hive. Control.   This is the one you want. The hive that contains this sub hive should have a number of Value name and Value data entries. The one named Friendly. Name will have a Value data entry that identifies the currently assigned COM port in parenthesis. This was the first solution I found and the only reason I didnt use it was that 1 the number of sub hives to be searched under the Enum starting point was different for the two types of devices I was using and 2 the ability to assign an ID number to the. I make no claims that the above is absolutely correct its simply what Ive discovered so far. I may eventually have to add a sixth board and find that none of the above works in which case Ill probably utter a rather loud expletive deleted.