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Universal Serial Bus (USB) provides an expandable, hot-pluggable Plug and Play serial interface that ensures a standard, low-cost connection for peripheral devices such as keyboards, mice, joysticks, printers, scanners, storage devices, modems, and video conferencing cameras. Migration to USB is recommended for all peripheral devices that use legacy ports such as PS/2, serial, and parallel ports.

The USB-IF is a Special Interest Groups (SIGs) that maintains the Official USB Specification, test specifications and tools.

Windows operating systems include native support for USB host controllers, hubs, and devices and systems that comply with the official USB specification. Windows also provides programming interfaces that you can use to develop device drivers and applications that communicate with a USB device.

USB in WindowsWindows 10: What's new for USB Overview of new features and improvements in USB in Windows 10. USB FAQ Frequently asked questions from driver developers about the USB stack and features that are supported in USB. Microsoft OS Descriptors for USB Devices Windows defines MS OS descriptors that allows better enumeration when connected to system running Windows operating system Microsoft-provided USB driversUSB device-side drivers in Windows A set of drivers for handling common function logic for USB devices. USB host-side drivers in Windows Microsoft provides a core stack of drivers that interoperate with devices that are connected to EHCI and xHCI controllers. USB-IF device class drivers Windows provides in-box device class drivers for many USB-IF approved device classes, audio, mass storage, and so on. USB generic function driver–WinUSB Windows provides Winusb.sys that can be loaded as a function driver for a custom device and a function of a composite device. USB generic parent driver for composite devices–Usbccgp Parent driver for USB devices with multiple functions. Usbccgp creates physical device objects (PDOs) for each of those functions. Those individual PDOs are managed by their respective USB function drivers, which could be the Winusb.sys driver or a USB device class driver. WDF extension for developing USB drivers USB connector manager class extension (UcmCx) reference USB host controller (UCX) reference USB function class extension (UFX) reference Testing USB devices with Windows Get information about the tools that you can use to test your USB hardware or software, capture traces of operations and other system events, and observe how the USB driver stack responds to a request sent by a client driver or an application. Read an overview of tests in the Hardware Certification Kit that enable hardware vendors and device manufacturers to prepare their USB devices and host controllers for Windows Hardware Certification submission. Other Resources for USB Official USB Specification Provides complete technical details for the USB protocol. Microsoft Windows USB Core Team Blog Check out posts written by the Microsoft USB Team. The blog focuses on the Windows USB driver stack that works with various USB Host controllers and USB hubs found in Windows PC. A useful resource for USB client driver developers and USB hardware designers understand the driver stack implementation, resolve common issues, and explain how to use tools for gathering traces and log files. OSR Online Lists - ntdev Discussion list managed by OSR Online for kernel-mode driver developers. Windows Dev-Center for Hardware Development Miscellaneous resources based on frequently asked questions from developers who are new to developing USB devices and drivers that work with Windows operating systems. USB-related videos UWP apps for USB devicesUnderstanding USB 3.0 in Windows 8Building great USB 3.0 devicesUSB Debugging Innovations in Windows 8 (Part I, II, & III) USB hardware for learning MUTT devices MUTT and SuperMUTT devices and the accompanying software package are integrated into the HCK suite of USB tests. They provide automated testing that can be used during the development cycle of USB controllers, devices and systems, especially stress testing. OSR USB FX2 Learning Kit If you are new to USB driver development. The kit is the most suitable to study USB samples included in this documentation set. You can get the learning kit from OSR Online Store.

Write a USB client driver (KMDF, UMDF) Introduces you to USB driver development. Provides information about choosing the most appropriate model for providing a USB driver for your device. This section also includes tutorials about writing your first user-mode and kernel-mode USB drivers by using the USB templates included with Microsoft Visual Studio. Write a USB host controller driver If you are developing an xHCI host controller that is not compliant with the specification or developing a custom non-xHCI hardware (such as a virtual host controller), you can write a host controller driver that communicates with UCX. For example, consider a wireless dock that supports USB devices. The PC communicates with USB devices through the wireless dock by using USB over TCP as a transport. USB host controller (UCX) reference Write a function controller driver for a USB device You can develop a controller driver that handles all USB data transfers and commands sent by the host to the device. This driver communicates with the Microsoft-provided USB function controller extension (UFX). USB function class extension (UFX) reference Write a USB Type-C connector driver Windows 10 introduces support for the new USB connector: USB Type-C. You can write a driver for the connector that communicates with the Microsoft-provided class extension module: UcmCx to handle scenarios related to Type-C connectors such as, which ports support Type-C, which ports support power delivery. USB connector manager class extension (UcmCx) reference Write a USB dual-role controller driver USB Dual Role controllers are now supported in Windows 10. Windows includes in-box client drivers for ChipIdea and Synopsys controllers. For other controllers, Microsoft provides a set of programming interfaces that allow the dual-role class extension (UrsCx) and its client driver to communicate with each other to handle the role-switching capability of a dual-role controller. For more information about this feature, see: USB dual-role controller driver programming reference Write a USB driver for emulated devices Windows 10 introduces support for emulated devices. Now you can develop an emulated Universal Serial Bus (USB) host controller driver and a connected virtual USB device. Both components are combined into a single KMDF driver that communicates with the Microsoft-provided USB device emulation class extension (UdeCx). Emulated USB host controller driver programming reference Write a UWP app Provides step-by-step instructions about implementing USB features in a UWP app. To write such an app for a USB device you need Visual Studio and Microsoft Windows Software Development Kit (SDK) . Write a Windows desktop app Describes how an application can call WinUSB Functions to communicate with a USB device. WinUSB functions Common programming scenarios List of common tasks that a driver or an app performs in order to communicate with a USB device. Get quick info about the programming interfaces you need for each task. USB samples Development tools Download kits and tools for Windows

Dec 21, 2020 • Filed to: USB Recovery • Proven solutions

Have you ever had difficulty connecting your devices to your computer using a Prolific USB to Serial adapter? If yes you are lucky to find this page, it will give you all the information need to fix an unresponsive Serial driver adapter. You may have noticed a yellow exclamation mark hovering over or beside the USB to Serial Driver when searching your Device Manager and if you have we can all agree that it signifies a prevailing problem.

Overview of the Error

If you are not able to connect your device to your PC using a USB to Serial adapter it may be that

• The USB driver is outdated
• The USB Driver is missing
• Or even a corrupted driver

While you can't be so sure what the exact problem is there are solutions you can adopt to fix the issue once and for all. Read on to find quick fixes to resolve the problem.

1# Fix Prolific USB to Serial Driver not Working

Solution: Roll your Prolific USB to Serial Driver back to an older version

Unitek Driver

Updating your drivers often work wonders for your system because it makes sure that it runs on the latest features that guarantee maximum functionality. Unfortunately updating your drivers can cause this kind of error especially if your latest update does not work too well with your hardware. Once you upgrade your PC to the latest Windows version your Prolific USB to Serial Driver also updates to the latest driver software and if the driver is not compatible with your Hardware issues may arise. To correct the error, you will have to download the driver again by following these steps.

• Right-click on your PC Start button and open Device Manager

• Double click LPT and COM ports then locate the Prolific USB to Serial Driver and right-click it so you can select Update Driver

• For driver software click My computer

• From My computer select 'Let me pick from a list of drivers available'

• Choose an older version from the list then click Next

• The driver you selected will be installed automatically
• Once it has been downloaded reconnect the driver to see if it works.

2# Fix Prolific USB to Serial Driver 'Coder 10'

Driver issues reveal themselves in so many ways or through messages such as

• This device will not start (Code 10)
• There is no driver installed in this device
• The driver was not successfully installed

A code 10 error may arise because the chip you are using is not an original one. If you are using a fake, the manufacturer has a way of disabling it due to copy write infringement and the copy write takes effect once you download a recent update. To protect your PC from getting this code, you will have to make sure that your Windows 10 never updates a driver without approval. Updates come in the form of 64 bit and 32-bit drivers. Below we will show you how to work your way around the problem.

Window 64 bit Fix

To fix Windows 64 bit OS including Prolific USB to Serial Adapter, follow through these steps.

• Download 'PL2303_64bit_Installer.exe and Save
• Remove every USB to Serial adapter from your PC and double click the 'PL2303_64bit_installer.exe
• Follow the prompt by plugging in one USB to Serial adapter the click on Continue
• Reboot your PC to get Windows up and running

If you have followed these process through and you still see the same error go to your device manager

• Open the control panel and navigate to Device Manager
• From your control panel navigate to the System category and click the Hardware tab
• Scroll to the LPT/COM port and double click Prolific USB to Serial Comm Port
• Click Drivers in the Properties section
• The Driver you choose should read '3.3.2.102 with an appropriate date attached
• If the date is wrong then it means the wrong driver was installed
• Unplug the Serial adapter and run the steps again to install the correct driver

Window 32-bit

For Windows 32-bit OS systems follow these steps

• You will have to download the 'PL-2303_Driver_Installer.exe and save from Microsoft download link
• Run the program and eradicate the driver if you can
• Run the installer once more to install a correct driver

To Troubleshoot for error if your device still does not work

• Go to Control panel, enter System to access your Device Manager
• Scroll down to the LPT/ COM port then double click Prolific USB to Serial Comm Port
• Click Driver in the Windows Properties section
• The driver must be numbered as '2.0.2.8' and dates accordingly

If the driver was not installed, remove the Serial adapter then run 'PL2303_Driver_Installer.exe' again. Follow directions in Device Manager to download the correct driver

The three solutions listed in this article have proven to be quite helpful in fixing a Prolific USB to Serial driver not working on Windows 10. They may appear confusing at first but if you follow each step in detail you can resolve the issue.

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