Prolific USB-to-Serial Comm Port (COM4) Driver

The Prolific USB-to-Serial Comm Port (COM4) driver lets Windows communicate with compatible serial equipment through a Prolific USB-to-serial adapter. It is useful for connecting devices such as industrial controllers, serial consoles, and legacy peripherals when your computer lacks a built-in serial port. COM4 is the port number assigned by Windows, not a separate adapter model.

Key Features

• Provides a virtual COM port so compatible applications can exchange data with connected serial equipment.
• Supports serial communication settings, including baud rate and flow control, through compatible software and Windows port settings.
• Enables Windows to recognize supported Prolific USB-to-serial hardware and display it under Ports (COM & LPT) in Device Manager.
• Offers driver options for Windows 10, 8.1, 7, Vista, and XP, depending on the adapter’s chipset revision and the selected driver package.

How to Install Prolific USB-to-Serial Comm Port (COM4) Driver

1. Identify your adapter and Windows version. Open Device Manager to check the adapter’s hardware IDs if needed, and confirm whether your operating system is 32-bit or 64-bit. For Windows 10/11 systems, verify chipset compatibility rather than assuming both versions use the same package; Windows 11 is not included in the supported OS list here.
2. Choose a compatible package. Before starting your Prolific USB-to-Serial Comm Port (COM4) driver download for Windows, check that the package supports both your operating system and adapter revision. Select a free download from a trusted source, preferably the hardware manufacturer.
3. Install the driver. Extract the downloaded archive if necessary, then run the installer and follow its instructions. If only driver files are supplied, use Device Manager’s Update driver option and browse to the extracted folder.
4. Connect and verify the adapter. Reconnect it when prompted, restart Windows if requested, and check Device Manager for a working entry under Ports (COM & LPT). Windows may assign a number other than COM4.
5. Configure your serial application. Select the assigned COM port and match the baud rate, parity, stop bits, and flow control to your connected equipment’s requirements.

Keep the driver updated when a compatible release addresses connection problems or supports changes to your system. Before you update, confirm that the latest version still supports your specific Prolific chipset and Windows edition—newer packages may not support older adapters.