Usb Cdc Serial

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SAMSUNG Mobile USB CDC Composite Driver: Version 2.12.3.0 (July 2016) Then come back to this point and right-click on the appropriate link above. Then click on save as and save the download driver on your computer and remember here you have downloaded it too. Now extract the CAB file ( right-click on the file and click on Extract to on the menu). A google search for ACM reveals that it is part of CDC (Communications Device Class) which is a USB communication class opposite of HID (i.e. A USB device may use HID or CDC). This wikipedia article reveals that CDC/ACM is a method of emulating RS-232 communication over USB.

Last updated

  • April, 2015

** OS version**

  • 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.

Note 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.

USBClass_02

USBClass_02&SubClass_02

  • 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 (or USB CDC) Specification found on the USB DWG website. 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.

Note 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:

HKEY_LOCAL_MACHINESYSTEMCurrentControlSetEnumUSB<hardware id><instance id>Device Parameters

Serial

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.

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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

I can't find a suitable driver for Windows Server 2012 for my CDC Serial device. I'm working on a Linux CDC serial device. Here, I'm using Linux on device, and I'm configuring my USB as Serial using Linux tty driver. I need to communicate to the device from Win Server 2012 R2 using this USB-Serial port.

On Windows 10, the this CDC Serial driver is detecting by default using Update. But I'm not understanding why it's not installing on Windows Server 2012. Any leads are much appreciated. ' Can you suggest if I can refer/modify those drivers to support the same device on Win server 2012? Or Is there any better way to do that?' That was my earlier recommendation.

The kernel is basically the same between Windows 8 and Windows Server 2012, so it is quite common to install a Windows 8 driver on a Windows Server 2012 installation for devices that do not have specific drivers for Windows Server 2012. Of course, whether or not it is supported is a completely different question.: :.: :. Hi SurendranT, Thank you for posting here. The desktop forum discusses general issues about developing applications for Windows.

Since your issue is related to Windows Server General forum. I will move the case to there. ' According to my previous reply, Maybe you need to write yourself driver for windows server 2012 or contact the Best Regards, Hart Please remember to click 'Mark as Answer' the responses that resolved your issue, and to click 'Unmark as Answer' if not. This can be beneficial to other community members reading this thread. If you have any compliments or complaints to MSDN Support, feel free to contact MSDNFSF@microsoft.com.

' Can you suggest if I can refer/modify those drivers to support the same device on Win server 2012? Or Is there any better way to do that?' That was my earlier recommendation. The kernel is basically the same between Windows 8 and Windows Server 2012, so it is quite common to install a Windows 8 driver on a Windows Server 2012 installation for devices that do not have specific drivers for Windows Server 2012. Of course, whether or not it is supported is a completely different question.: :.: :.