Drivers Tektronix Port Devices

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To install the cab file for the MediaTek DA USB VCOM (Android) Driver follow the steps below. You may need to do a forced install which you can learn about here: How to Force Install a Driver. In the device manager, right click on the device and go to update driver. Browse to the location of the extracted driver and select the driver and install. KitchenGo KDS Win the kitchen with KitchenGo Not all Kitchen Display Systems (KDS) are created equal. With over 30 years of experience in business automation, we have developed industry-leading software and hardware KDS solutions that can streamline and scale your business. Virtual COM port (VCP) drivers cause the USB device to appear as an additional COM port available to the PC. Application software can access the USB device in the This page contains the VCP drivers currently available for FTDI devices. For D2XX Direct drivers, please click here.


Versions supported

  • Windows 10
  • Windows 8.1

Applies to

  • Device manufacturers of CDC Control devices

Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.

In Windows 10, the driver has been rewritten by using the Kernel-Mode Driver Framework that improves the overall stability of the driver.

  • Improved PnP and power management by the driver (such as, handling surprise removal).
  • Added power management features such as USB Selective Suspend.

In addition, UWP applications can now use the APIs provided by the new Windows.Devices.SerialCommunication namespace that allow apps to talk to these devices.

Usbser.sys installation

Load the Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.


If you trying to install a USB device class driver included in Windows, you do not need to download the driver. They are installed automatically. If they are not installed automatically, contact the device manufacturer. For the list of USB device class driver included in Windows, see USB device class drivers included in Windows.

Windows 10

In Windows 10, a new INF, Usbser.inf, has been added to %Systemroot%Inf that loads Usbser.sys as the function device object (FDO) in the device stack. If your device belongs to the Communications and CDC Control device class, Usbser.sys is loaded automatically.You do not need to write your own INF to reference the driver. The driver is loaded based on a compatible ID match similar to other USB device class drivers included in Windows.



Drivers Tektronix Port Devices
  • If you want to load Usbser.sys automatically, set the class code to 02 and subclass code to 02 in the Device Descriptor. For more information, see USB communications device class. With this approach, you are not required to distribute INF files for your device because the system uses Usbser.inf.
  • If your device specifies class code 02 but a subclass code value other than 02, Usbser.sys does not load automatically. Pnp Manager tries to find a driver. If a suitable driver is not found, the device might not have a driver loaded. In this case, you might have to load your own driver or write an INF that references another in-box driver.
  • If your device specifies class and subclass codes to 02, and you want to load another driver instead of Usbser.sys, you have to write an INF that specifies the hardware ID of the device and the driver to install. For examples, look through the INF files included with sample drivers and find devices similar to your device. For information about INF sections, see Overview of INF Files.


Microsoft encourages you to use in-box drivers whenever possible. On mobile editions of Windows, such as Windows 10 Mobile, only drivers that are part of the operating system are loaded. Unlike desktop editions, it is not possible to load a driver through an external driver package. With the new in-box INF, Usbser.sys is automatically loaded if a USB-to-serial device is detected on the mobile device.


Windows 8.1 and earlier versions

In Windows 8.1 and earlier versions of the operating system, Usbser.sys is not automatically loaded when a USB-to-serial device is attached to a computer. To load the driver, you need to write an INF that references the modem INF (mdmcpq.inf) by using the Include directive. The directive is required for instantiating the service, copying inbox binaries, and registering a device interface GUID that applications require to find the device and talk to it. That INF specifies 'Usbser' as a lower filter driver in a device stack.

The INF also needs to specify the device setup class as Modem to use mdmcpq.inf. Under the [Version] section of the INF, specify the Modem and the device class GUID. for details, see System-Supplied Device Setup Classes.

For more information, see this KB article.

Configure selective suspend for Usbser.sys

Starting in Windows 10, Usbser.sys supports USB Selective Suspend. It allows the attached USB-to-serial device to enter a low power state when not in use, while the system remains in the S0 state. When communication with the device resumes, the device can leave the Suspend state and resume Working state. The feature is disabled by default and can be enabled and configured by setting the IdleUsbSelectiveSuspendPolicy entry under this registry key:

To configure power management features of Usbser.sys, you can set IdleUsbSelectiveSuspendPolicy to:

  • '0x00000001': Enters selective suspend when idle, that is, when there are no active data transfers to or from the device.

  • '0x00000000': Enters selective suspend only when there are no open handles to the device.

That entry can be added in one of two ways:

  • Write an INF that references the install INF and add the registry entry in the HW.AddReg section.

  • Describe the registry entry in an extended properties OS feature descriptor. Add a custom property section that sets the bPropertyName field to a Unicode string, 'IdleUsbSelectiveSuspendPolicy' and wPropertyNameLength to 62 bytes. Set the bPropertyData field to '0x00000001' or '0x00000000'. The property values are stored as little-endian 32-bit integers.

    For more information, see Microsoft OS Descriptors.

Develop Windows applications for a USB CDC device

If you install Usbser.sys for the USB CDC device, here are the application programming model options:

  • Starting in Windows 10, a Windows app can send requests to Usbser.sys by using the Windows.Devices.SerialCommunication namespace. It defines Windows Runtime classes that can use to communicate with a USB CDC device through a serial port or some abstraction of a serial port. The classes provide functionality to discover such serial device, read and write data, and control serial-specific properties for flow control, such as setting baud rate, signal states.

  • In Windows 8.1 and earlier versions, you can write a Windows desktop application that opens a virtual COM port and communicates with the device. For more information, see:

    Win32 programming model:

    • .NET framework programming model:

Related topics

Drivers Tektronix Port Devices Download

This guide assumes you have already attempted installation of the USB driver supplied with the computer interface cable. If not, follow the instructions supplied with the computer interface cable. This guide should be referenced only if you are experiencing a driver installation failure.

Return to the support page.

This troubleshooting guide will help you fix driver installation problems on a Windows 8 computer.
The most common reason the computer interface cable fails to work is because Windows chooses to install its own driver for the USB cable instead of the driver you just loaded from the FarmTek CD or website. Follow these steps to confirm and correct this problem.

1. With the USB adapter cable plugged into the computer, follow these steps to open the Device Manager:

a. From the Start screen, push and hold the Windows key () and then press 'x' on your keyboard. Choose 'Device Manager' from the menu that pops up.

2. Look down the list of items for the 'Ports' category. Click the arrow to the left of 'Ports' to expand the category. The USB adapter will show as 'Prolific USB-to-Serial...' followed by the assigned COM port number. If there is a small error icon with an exclamation mark as shown here, Windows installed the wrong driver.

Note 1: If an error is NOT shown, then the driver is installed correctly – do NOT follow the rest of this guide.

Note 2: If the 'Ports' category is not present, or the 'Prolific USB-to-Serial...' device is not listed under 'Ports,' then click here.

3. Uninstall the USB adapter and its drivers:

a. Right click on 'Prolific USB-to-Serial Comm Port' and choose 'Uninstall'

b. When asked to confirm, choose to delete the driver software and click 'OK'

c. After the uninstall completes, unplug the USB adapter from your computer and close the Device Manager. Do NOT plug the USB adapter back into the computer.

4. Disable Windows from automatically choosing its own drivers:

a. From the Desktop, push and hold the Windows key () and then press 'x' on your keyboard. Choose 'Run' from the menu that pops up.

b. In the 'Run' dialog box, type in'control printers' and click 'OK'.

c. Right click on your computer's icon under 'Devices' and choose 'Device Installation Settings'

d. Change driver installation preference to 'No, let me choose what to do' and 'Never install driver software from Windows Update,' then click 'Save Changes.'

5. Reboot your computer

6. Install the USB to Serial drivers from the FarmTek CD or from the website:

• If the installation prompts you with the option to remove the driver, then a driver is already installed on your system and should be removed. Follow the prompts to remove the driver. Reboot your computer after removing the driver. Once your computer reboots, start the driver installer again and continue immediately below.

Drivers Tektronix Port Devices Adapter

• Follow the driver installation wizard through until the final screen on which the 'Finish' button is displayed. Click 'Finish' to complete the installation.

7. Plug in the USB cable. Windows will install the cable and driver at this time. Windows 8 does not provide much in the way of feedback during this process, so wait about 15 seconds, then bring up the Device Manager as instructed in step 1. Look down the list of items for the 'Ports' category and click the arrow to the left of 'Ports' to expand the category. The 'Prolific USB-to-Serial...' device should be listed. Verify the error icon (!) is NOT present. The COM port assigned to the cable will be shown on the right.

Note: In the future, as long as you plug the USB cable into the same physical USB port, the cable will be assigned the same COM port number. If you plug into a different USB port, a different COM port number will be assigned.

Return to the support page.