Silicon Labs CP210x USB to UART Bridge (COM4) Driver

The Silicon Labs CP210x USB to UART Bridge (COM4) driver lets Windows communicate with compatible USB-to-serial hardware through a virtual COM port. Provided by Silicon Laboratories, it is needed for devices such as development boards, embedded controllers, and serial adapters that use a CP210x bridge.

Key Features

• Virtual serial port access: Allows terminal programs, programming tools, and other serial applications to communicate with connected CP210x hardware.
• USB-to-UART communication: Supports data exchange between your computer’s USB connection and a compatible device’s UART interface.
• Windows compatibility: Driver packages are available for Windows 10, 8.1, 7, Vista, and XP, but compatibility depends on the selected release and system architecture.
• Device Manager integration: Displays the connected bridge under Ports (COM & LPT), where you can check its status and assigned port. COM4 is a Windows-assigned port number and may differ on another computer.

How to Install Silicon Labs CP210x USB to UART Bridge (COM4) Driver

1. Check your system. Confirm your Windows version and whether it is 32-bit or 64-bit. For Windows 10/11 systems, check the package’s stated compatibility rather than assuming every release supports both.
2. Choose the appropriate package. When selecting a Silicon Labs CP210x USB to UART Bridge (COM4) driver download for Windows, use a trusted source and match the package to your operating system. The latest version may not support older Windows releases; the vendor’s driver should be available as a free download.
3. Extract and install the driver. Unzip the package if necessary, then follow its included instructions. Run the installer if provided, or use Device Manager’s Update driver option to browse to the extracted driver folder.
4. Connect your hardware. Plug the CP210x device into a USB port using a data-capable cable. Allow Windows to finish detecting it, and restart only if prompted.
5. Verify the connection. Open Device Manager and check Ports (COM & LPT). Confirm that the bridge appears without a warning icon, then select its assigned COM port in your serial application.

Keep the driver updated when a compatible release addresses connection problems or supports a Windows upgrade. Before you update, review compatibility notes—especially on Windows 7, Vista, or XP—and retain a working installer in case you need to restore your previous setup.