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These devices are not used to control external sound modules or virtual instruments within Studio One, but rather Studio One itself. Setting up an External MIDI Keyboard Controller. A MIDI keyboard controller is a hardware device that is generally used for playing and controlling other MIDI devices, virtual instruments, and software parameters. Visit the Web site of the device manufacturer if the device was preinstalled on your computer and the computer manufacturer does not have an updated driver. Look for a Drivers section or a Download section on the manufacturer’s Web site, and search for the device name. Download and install the Windows XP version of the driver. The ADAM-4571L provides a robust and cost effective way to network-enable equipment in an industrial automation environment. It also brings the advantages of remote management and data accessibility to RS-232 devices. The transmission speed of the ADAM-4571L is up to 921.6 Kbps, meeting the demands for high-speed data exchanges. By encapsulating serial data and transporting it over Ethernet. If Windows is using the wrong device driver for the FlashPro4/3x/3/LCPS, the offending device driver must be removed. To do this, the device driver needs to be identified. The device driver could appear under: – The Human Interface Devices (HID) list: If you have multiple HID devices, you will need to check the driver properties and find one.

Calman Display Calibration Software directly controls many hardware devices, including light meters, pattern sources, LUT processors, and display devices. The control interface to these devices may be USB, RS-232 serial, or wired or wireless network IP connections.

If the hardware device has a USB interface connection and is connected to a USB computer port, the computer needs to have a device driver installed (unless it is a USB HID device; see below). The device driver tells the computer how to properly handle data communications between the computer and the hardware USB device.

USB HID Devices

The USB Human Interface Device (HID) class is a specification for computer peripherals such as keyboards, mice, and game controllers. A computer doesn’t require a separate device driver for USB HID devices because they are recognized and handled directly by the Windows operating system. Other devices that comply with the USB HID spec are also recognized automatically by a computer and don’t require a separate device driver.

USB HID devices that are supported by Calman include the SpectraCal C6 Colorimeter and the X-Rite i1Display light meters. When one of these meters is plugged into a computer, Windows automatically connects to the meter without requiring an external device driver.

Network Control Devices

If the hardware device is connected to a computer via a wired or wireless IP network connection, the computer does not require a device driver for that device.

Serial Control Devices

If the hardware device has an RS-232 serial connection and is directly connected to a computer serial port, the computer does not require a device driver for that device.

However, since most computers no longer provide a serial port, a serial hardware device will usually be connected to a computer via a USB to serial converter. In that case, the computer needs to have a device driver installed to properly communicate through the USB to serial converter.

USB to Serial Converters

If a hardware device has an RS-232 serial connection, a USB to serial converter is usually used to connect the serial device to a computer’s USB port.

The computer sends data to and receives data from the USB port on the converter. The converter translates that data, through its serial port, to a serial hardware device. The computer requires a device driver to tell it how to properly handle data communications with the USB port on the USB to serial converter.

A data buffer is included within some USB to serial converters. The data buffer improves the reliability of a device interface at high data rates. Many USB to serial converters without a data buffer do not provide a reliable interface between Calman and hardware devices. The USB to serial converters produced by FTDI include a data buffer. The FTDI converters have been tested with all hardware devices supported by Calman and have been certified to provide a reliable interface in all cases.

For more information, see the Calman setup guide for the FTDI USB to serial converters.

Obtaining Device Drivers

Device drivers can be obtained in a number of ways.

The required device driver can often be obtained from the hardware device manufacturer. Device manufacturers may package a device driver with the device or they may provide a device driver download on their device support page.

In cases where the manufacturer supplies operating software with the hardware device, the device driver may be installed as part of the manufacturer’s operating software installation.

If you will only ever connect one or two USB devices to a Calman computer, you may wish to obtain the device driver for your device(s) directly from the device manufacturer.

For convenience, SpectraCal provides a Device Driver Pack that includes device drivers for most of the hardware devices supported by Calman.

To ensure that you have the proper driver, or if you will be connecting a number of different USB devices to Calman, you may wish to download the Calman Device Driver Pack from the Calman Download page to install all supported device drivers on the Calman computer.

Installing Device Drivers

Installing the SpectraCal Device Driver Pack on a Calman computer automatically installs and registers the included device drivers for Calman supported hardware. Installing a driver that you obtain directly from a device manufacturer also automatically registers the device driver in Windows.

When a hardware device is then connected to the Calman for the first time, the proper device driver is automatically associated with the device.

Unsigned Device Drivers

Many currently available device drivers have not been tested and certified by Microsoft. These drivers are referred to as unsigned device drivers. Some of the drivers provided in the SpectraCal Device Driver Pack are unsigned.

Windows 7 or Earlier

If you are installing an unsigned device driver in Windows 7 or earlier, a Windows Security dialog will open to give us a choice of whether or not to install an unsigned device driver. If you feel comfortable with the source of your device driver file, you will probably want to select the Install Anyway option.

Windows 8.0 or Later

If you are installing an unsigned device driver in Windows 8.0 or later, you will need to follow one of the special driver installation procedures below.

  • Windows 8.0
  1. Open Settings (move your mouse to the top or bottom right corner of the screen and wait for the charm bar to appear, then click the Gear icon)
  2. Click Change PC Settings
  3. Click General
  4. Scroll down and click Restart Now under Advanced Startup
  5. Click Troubleshoot
  6. Click Advanced Options
  7. Click Windows Startup Settings
  8. Click Restart
  9. When the computer restarts, select Disable Driver Signature Enforcement from the list.
  10. You can now load the unsigned driver(s). After restarting the computer, any drivers that you installed will continue to function.

Note: This may need to be repeated each time you update your graphics driver.

  • Windows 8.1 and Windows 10
  1. While holding down the Shift key, go to SettingsPowerRestart
  2. On shutdown, you will be presented a list of Options. Select Troubleshoot
  3. On the Troubleshoot menu, select Advanced Options
  4. On Advanced Options, select Startup Settings
  5. Click Restart - Machine will reboot.
  6. This will bring you to Startup Settings. Select 7 - Disable driver signature enforcement

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When Windows starts, Driver Signature Enforcement is disabled.

You can now load the unsigned driver(s).

After a normal reboot, Driver Signature Enforcement will re-enable. Any drivers that were installed while it was disabled will continue to function.

Windows Device Manager

When a USB-controlled hardware device is connected to a computer, Windows first needs to recognize the device and properly connect to it. The proper device driver needs to be registered with Windows to support that device connection. Only if Windows is properly connected to a device, will Calman also then be able to connect to the device.

Windows Device Manager is the important software utility for managing Windows connections to the external hardware devices that we are then going to want to connect to Calman. Device Manager allows us to check a device connected to Windows and manage the device’s driver registration.

Note: When Calman is unable to connect to a USB-controlled hardware device (or a USB to serial converter), Device Manager is one of the first places to check.

Any device that is connected to a computer’s USB port will create a device listing in Device Manager. The device will either be listed under an existing device type (e.g. “Ports (COM & LPT)”, or a new Device Type will appear (e.g. “X-Rite Devices”)

Under its particular Device Type, the device will be given a Device Description (e.g. “USB Serial Port (COM6),” “ColorMunki Smile”).

Alternately connecting and disconnecting the USB plug for the device in question may help to identify which device listing in Device Manager corresponds to the hardware device in question.

Virtual COM Port Drivers

Some USB devices use a Virtual COM port (VCP) driver, which causes the USB device to appear as an additional COM port available to the PC (listed in Windows Device Manager, under the Ports (COM & LPT) type, as a “USB Serial Port (COMx)” device.

Calman software can then access the USB device as it would a standard COM port. Note the designated COM port number in Device Manager (COMx), as you will need to select that port number on the Calman device connect dialog.

Normal Device Manager Listings

Following are many of the popular hardware devices that are supported by Calman that require a Windows device driver to support their USB connection. Following each device name is the Device Type and Device Description, as they will be listed in Device Manager when the proper device driver is installed.

If your device is listed some other way in Device Manager, the device driver is not installed properly.

  • AV Foundry VideoForge Classic
    • Network Adapters > RNDIS Gadget
  • EIZO Monitors
    • Human Interface Devices >
  • Fujifilm IS-mini
    • Universal Serial Bus Controllers > IS-mini
  • FTDI USB to Serial Converter
    • Universal Serial Bus Controllers > USB Serial Converter
  • HDfury Integral 4K60
    • Universal Serial Bus Controllers > USBXpress Device
  • HP Z27x
    • Libusb-win32 devices > HP Z27x USB
  • Klein K10
    • Universal Serial Bus Controllers > USB Serial Converter
      (meter has internal FTDI converter)
  • Lumagen Radiance Pro
    • Ports (COM & LPT) > USB Serial Port (COMx)
  • Murideo SIX-G
    • Ports (COM & LPT) > USB Serial Port (COMx)
  • Quantum Data 780-series generators
    • Ports (COM & LPT) > USB Serial Port (COMx)
  • SpectraCal C3 Colorimeter
    • X-Rite Devices > ColorMunki Smile
  • SpectraCal C6 Colorimeter
    • Human Interface Devices > USB Input Device
  • SpectraCal ColorBox/eeColor
    • Universal Serial Bus Controllers > USB Serial Converter A, USB Serial Converter B
      (unit has internal FTDI converters)
  • SpectraCal VideoForge PRO
    • Ports (COM & LPT) > USB Serial Port (COMx)
  • UPRtek MK550T Spectroradiometer
    • Human Interface Devices > USB Input Device
  • X-Rite i1Pro 2
    • X-Rite Devices > i1 Pro
  • X-Rite i1Display
    • Human Interface Devices > USB Input Device

Updating a Device Driver

If a hardware device was connected to the computer before its correct device driver was installed, Windows may have registered an incorrect device driver to the device. In that case, you may need to uninstall the incorrect driver (in Windows Device Manager), then reconnect the device to the correct device driver.

Follow these steps to update a device driver:
  1. Identify the device listing in Windows Device Manager that corresponds to the hardware device of interest. Alternately connect and disconnect the device USB connection as you are watching the Device Manager screen to identify the listing.
  2. Right-click on the device description and select Update driver from the pop-up menu.
  3. When asked how you want to search for drivers, select Browse my computer for driver software
  4. On the following screen, click the Browse button.
  5. Navigate to the drive folder containing the correct driver for the hardware device. For the Device Driver Pack, that is:
    C:Program Files (x86)SpectraCalDrivers (corresponding device folder)
  6. Click the OK/Next button to update the driver.

The Unknown USB device (device descriptor request failed) in Windows Device Manager on HP and Lenovo would stop your USB devices like an Android mobile, flash drive or pen drive from being properly detected for use in Windows 10, 8 or 7, but we finally resolved the USB not recognized problem for you. In case any USB malfunction could endanger data, let EaseUS Data Recovery Wizard recover data from the inaccessible USB drive.

Unknown USB Device (Device Descriptor Request Failed) is a Windows Device Manager error under the 'Universal Serial Bus controllers' section. The current device status is demonstrated as 'Windows has stopped this device because it has reported problems. (Code 43). A request for the USB device descriptor failed.'

What Is a Device Descriptor?

The device descriptor (USB_DEVICE_DESCRIPTOR) is the root of the descriptor tree and contains basic device information. idVendor and idProduct of which are the unique members for the Windows operating system to identify the connected device and determine which device driver must be loaded.

Anyway, we don't care about the tech-savvy's jargon, but only get to know - how do I fix the device descriptor when the request failed?

How Do I Fix Device Descriptor Request Failed?

Driver issues take the most responsibility for an unknown USB device on HP, Lenovo, Dell, and many computers. As you've concerned, the device descriptor request failed error is a generic unknown USB problem, so it's reasonable to suspect a driver issue at present. The USB device here mentioned can be a flash drive, pen drive, Android, digital camera, and any digital gadget that is supposed to use on a Windows machine.

In the next part, we mainly show you the common troubleshooting methods for the device descriptor request failed error in Windows 10. As a matter of fact, Windows 7 and Windows XP users are also having the same problem. Never mind applying the solutions to your own Windows operating system. They're all-OS-versions compatible.

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3 Quick Fixes to Unknown USB Device (Device Descriptor Request Failed) in Windows 10

In case that unknown USB device (device descriptor request failed) error happens because the USB port is not working or USB device is damaged, the following three fixes are significant to try before going to further troubleshooting.

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  1. 1. Try plugging in a working USB drive to check whether the USB port is working or damaged.
  2. 2. Plug your USB into a different PC to check whether the USB drive is working or damaged.
  3. 3. Check if the USB device shows up in Disk Management. As long as the data matters, download EaseUS free data recovery software to recover data from the inaccessible USB device in advance.

Step 1. Run USB data recovery software.

Connect the USB flash drive to your computer and launch EaseUS USB data recovery software on your PC. Select your USB drive which marks as a removable disk, and click 'Scan' to start finding your lost files.

Step 2. Scan all lost files from USB.

EaseUS Data Recovery Wizard will thoroughly scan your USB flash drive and find all your lost data on it. After the scanning process, use the Filter feature to filter a specific file type. You can check and preview found USB files in this program.

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Step 3. Restore all lost files from USB.

A double-click will allow you to preview the file results. Choose the target files and click 'Recover' to save them to a secure location on your PC or other external storage devices.

5 Advanced Fixes to Unknown USB Device (Device Descriptor Request Failed) in Windows 10

Due to the uncertainty of the exact factor that causes your USB drive malfunctioning in this way, the demonstrated solutions are not all supposed to take effect. Hence, take some patience to implement each solution until the problem solved.

1. Use Hardware and Devices troubleshooter

  • Press Win+R, type Control Panel and hit Enter.
  • Inside Control Panel in the search box type troubleshooter and select Troubleshooting.
  • After that select Configure a device under Hardware and Sound and follow the on-screen instruction.
  • Click on Apply this fix if any problem is found.

If the unknown USB device error is triggered by hardware issues, it will no longer appear after you try the above steps. If not, you need to move on to the next method to find a fix.

2. Try to Uninstall USB Drivers

  • Open Device Manager (Right Click on Windows Logo and Click Device Manager).
  • Now find and expand Universal Serial Bus controllers. Now right-click on USB drivers and click Uninstall. Do for all USB drivers one by one.
  • Restart your PC then Windows will reinstall the device automatically.

Some people would find that uninstalling and reinstalling the driver only works once. The next time they plug in the drive, and the device descriptor request failed appears again. According to an experienced user who has been suffering the problem for long but finally found the cause of why this method does not work and how to make it work.

I found that going into Device Manager and 'Uninstalling the device', and then plugging in the USB I had been using at the time, before telling Device Manager to scan for hardware changes in the USB ports fixed this problem. I think it was because I've had this USB receiver for a mouse plugged into it for so long, that when I removed it from the port, the computer didn't recognize that it'd been removed and got caught in a loop trying to identify a device that wasn't there anymore, locking the USB port down. Works fine now.

3. Disable Fast Startup

  • Press Win+R, type Control Panel and hit Enter.
  • Click on Power Options and select Choose what the power buttons do in the left pane.
  • Click on Change settings that are currently unavailable.
  • Under Shutdown settings, uncheck the box next to Turn on fast startup (recommended). Then click on the Save changes button.

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4. Turn on Plug and Play in Windows Services

  • Press Win+R, type services.msc and hit Enter.
  • In Windows Services, find the name Plug and Play. Double-click on it to open the Properties window.
  • If the Startup type is currently Manual and the Service status is Running, try to turn it to Disabled and Stopped, save the changes; later change the Disabled and Stopped to Manual and Running again. Click OK and Apply.
  • If the Startup type is currently Disabled and the Service status is Stopped, switch to Manual and Running. Click OK and Apply.

Restart your PC and see if the unknown USB device problem has been resolved in Windows 10. if it doesn't work, try to perform a system restore to get rid of this issue.

5. Restore Your PC To Previous Recovery Points

  • Press Win+R, type Control Panel and hit enter.
  • Now find and open the Recovery option.
  • Select System Restore, follow the on-screen guide and wait until all the recovery points are shown.
  • Restore your PC from the right recovery point.