JLink CDC UART Port (COM3) Driver

The JLink CDC UART Port (COM3) driver enables Windows to recognize the USB virtual serial interface provided by compatible Segger J-Link hardware. It lets terminal programs and development tools communicate with a connected target through UART, making it useful for developers who need serial console access, diagnostic output, or embedded-device troubleshooting.

Key Features

• USB-to-serial communication: Provides access to the CDC UART interface on compatible J-Link devices so applications can exchange serial data with the target hardware.
• COM port access: Makes the interface available as a Windows serial port. Although this device is listed as COM3, Windows may assign a different port number on your computer.
• Development workflow support: Helps you read debug messages and interact with a target’s serial console using suitable terminal software and matching UART settings.
• Windows compatibility options: Driver packages may support Windows 10, 8.1, 7, Vista, and XP. Check the selected package’s requirements, since newer releases may no longer support older systems.

How to Install JLink CDC UART Port (COM3) Driver

1. Check your system and hardware. Confirm your Windows version, system architecture, and J-Link model. For Windows 10/11 systems, verify compatibility explicitly; Windows 11 is not included in the supported OS list provided for this device.
2. Choose a compatible package. Before starting your JLink CDC UART Port (COM3) driver download for Windows, review the package details. Select the latest version that supports both your hardware and operating system, and use a trusted free download source.
3. Run the installer. If the driver is supplied with a J-Link software package, launch its installer and follow the prompts to install the relevant USB components. Allow administrator access if requested.
4. Connect and verify the device. Attach the compatible J-Link hardware using a data-capable USB cable. Open Device Manager and look under “Ports (COM & LPT)” for the UART interface and its assigned COM number.
5. Test serial communication. Select that COM port in your terminal application, then configure the baud rate and other serial settings to match your target. If a warning icon appears, review the installation status and package compatibility.

Keep the driver updated when a compatible release addresses connection issues or improves support for your setup. Before an update on an older Windows system, check the release notes and retain a working installer in case you need to revert.