JLink CDC UART Port (COM8) Driver

The JLink CDC UART Port (COM8) driver lets Windows recognize the virtual serial interface provided by compatible Segger J-Link hardware, allowing software to communicate with a connected target through UART. It is useful for embedded developers, technicians, and anyone who needs serial console access, diagnostic output, or data exchange alongside their debugging workflow.

Key Features

• Virtual COM port access: Makes the CDC UART interface available to terminal programs and development tools that communicate through a Windows serial port.
• UART communication: Supports sending and receiving serial data through compatible hardware, including application logs and interactive console commands.
• Device identification: Helps Windows identify the UART interface so you can locate it in Device Manager and select it in your software.
• Support for older Windows systems: Suitable driver packages may support Windows 10, 8.1, 7, Vista, and XP. Check the individual package requirements, since the latest version may not support every older system.

How to Install JLink CDC UART Port (COM8) Driver

1. Check your system and hardware. Confirm your Windows version and whether it uses a 32-bit or 64-bit architecture. Make sure your J-Link model provides a CDC UART interface. For Windows 10/11 setups, verify compatibility explicitly; Windows 11 is not included in this page’s listed supported systems.
2. Choose a compatible package. Before starting your JLink CDC UART Port (COM8) driver download for Windows, review the package’s supported operating systems and hardware requirements. Use a trusted, vendor-provided free download rather than an unrelated driver updater.
3. Run the installer. Extract the downloaded archive if necessary, then install the compatible Segger software or driver package using its setup instructions. Allow administrator access if Windows requests it.
4. Connect and verify the device. Connect the J-Link hardware using a data-capable USB cable. Open Device Manager and check under “Ports (COM & LPT)” for the UART interface. Windows may assign a port number other than COM8; this is normal.
5. Configure your serial application. Select the assigned COM port and match the baud rate, parity, and other serial settings to your target device. If detection fails, check the USB connection and review any Device Manager error before reinstalling.

Keep the driver updated when a compatible release addresses connection issues or improves support for your setup. Before you update, confirm that the latest version still supports your Windows edition, especially on legacy systems.