This is the RS232 driver for the USB adapter. In order to setup the driver you need to download the correct USB driver file and run the installer in the file. Once this has been installed you then need to reboot the computer. Once this is done plug the USB into the adapter.

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• Prolific Usb Drivers Windows 10
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Dec 24, 2014  Right-click on the “Prolific USB to Serial Port”, then click Properties. Now click on “Port Settings”. Then click the “Advanced” button. Always uncheck “Use automatic settings”. Now select “Input/Output range”. Click on the “Change Settings” option. Type “02E8-02EF” in the Value box. This value will change the port to COM 4. Replacing your Old USB to Serial Adapter with our New USB To serial adapter should be completely seamless. You can plug out adapter in and click update drivers from Windows and it will automatically download the drivers directly from Microsoft. The Drivers are fully certified. Looking for a USB to Serial adapter BEST BUY!

Common Problems:

Windows 2000:

• Right-click on the “Prolific USB to Serial Port”, then click Properties.
• Now click on “Port Settings”. Then click the “Advanced” button.
• Always uncheck “Use automatic settings”.
• Now select “Input/Output range”. Click on the “Change Settings” option.
• Type “02E8-02EF” in the Value box. This value will change the port to COM 4.

If COM 4 is in use, you must choose another port. The values for each port are.

Dec 22, 2015  1) Download a driver (Ex. Prolific usb to rs232) 2) Right click on the setup and choose troubleshoot compatibility or run it as a program that is compatible for earlier version of windows. 3) Install Driver. 4) Restart Computer. I just tried this and it worked but make sure you restart computer.

• COM 1: 03F8-03FF
• COM 2: 02F8-02FF
• COM 3: 03E8-03EF
• COM 4: 02E8-02EF

Enter the value, then click OK. Click OK again, then click Yes when the “Creating a Forced Configuration” window appears. Click OK.

Windows Generic:

If you are having problems then check if you have installed the driver correctly. Microsoft helvetica font download. This is done by doing the following on your computer to check the installation. If the USB driver has been properly installed, “Serialio.com USB Serial Port” or “Prolific USB-to-Serial COM Port” will be displayed.

Windows Vista: Start >> Control Panel >> System >> Hardware >> Device Manager

USB to RS232 Driver Download (Windows 7/Vista – 32bit and 64bit)

USB to RS232 Driver Download (Windows 7/Vista/2000 – 32bit and 64bit)

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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.

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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

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:

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• 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:

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