I have used this method as outlined as the preferred method by FTDI for years with no issues until now. Without a valid serial number, I cannot open the device. I use the FTDI serial number to open the device by its serial number. The device type comes back as value 0x03 which is FT_Device_Unknown and the description and serial number appear to come back empty. Then I call FT_GetDeviceInfoDetail to obtain the device type, description, and FTDI serial number. What I have found is that calling FT_CreateDeviceInfoList does return the correct number of devices connected. FTDI released driver version 2.12.36.2 on and I was hoping that it would resolve the issue but it did not. I wrote a wrapper class over 10 years ago that has worked fine until the new FTDI driver 2.12.36.1 was updated on client's computers. I am having what sounds like the same issue. Being new to Stack overflow it wouldn't let me simply add a comment to your question, or I don t know what I am doing. If (info.Type != FTDI.FT_DEVICE.FT_DEVICE_232R) If (info.Description != 'FT232R USB UART') This function can also be used after re-programming the EEPROM to force the FTDI device to read the new EEPROM contents which previously required a physical disconnect-reconnect. Possible use of this function is in situations where a fatal error has occurred and it is difficult, or not possible, to recover without unplugging and replugging the USB cable. The effect of this function is the same as disconnecting then reconnecting the device from USB. If (info.Type = FTDI.FT_DEVICE.FT_DEVICE_UNKNOWN) Here is my code: List pcdSerials = new List() įTDI.FT_STATUS ftStatus = FTDI.FT_STATUS.FT_OK įtStatus = ftdi.GetNumberOfDevices(ref ftdiDeviceCount) įTDI.FT_DEVICE_INFO_NODE ftdiDeviceList = new FTDI.FT_DEVICE_INFO_NODE įtStatus = ftdi.GetDeviceList(ftdiDeviceList) Drivers were already updated and also installed manually. The device is detected and displayed in both cases in the windows device manager. I tried to use CyclePort to reconnect the device, but this fails with status FT_OTHER_ERROR. If I first start the software and then plug in the device, it it not detected. Strange behaviour is, that when I first plug in my device and then start the software, everything works fine. This usually worked fine, but due to an windows update my device is detected as FTDI_DEVICE_UNKNOWN. I want to detect a connected usb device (FT232R USB UART, Virtual com port driver).

Driver software ft232r usb uart