JLink CDC UART Port (COM23) Driver

The JLink CDC UART Port (COM23) driver helps Windows recognize the USB-to-serial interface on compatible Segger J-Link hardware, allowing software to communicate with a connected target through a virtual COM port. It is useful for developers and technicians who need UART console access, diagnostic output, or serial communication while working with embedded devices.

Key Features

• Virtual serial port access: Makes the supported J-Link UART interface available to terminal programs and development tools through a Windows COM port.
• USB connectivity: Supports communication between compatible Segger hardware and the PC over USB.
• UART workflow support: Enables serial console input and output when the target hardware, wiring, and communication settings are configured correctly.
• Windows driver integration: Helps Windows identify the interface in Device Manager. The COM23 designation is a Windows-assigned port number and may differ on another computer.

How to Install JLink CDC UART Port (COM23) Driver

1. Check your Windows version and hardware. This listing covers Windows 10, 8.1, 7, Vista, and XP. Confirm that the selected package supports your operating system and system architecture. For Windows 10/11 systems, do not assume Windows 11 compatibility from a Windows 10 listing; verify it with Segger.
2. Choose the appropriate package. Before starting your JLink CDC UART Port (COM23) driver download for Windows, review the package details and supported hardware. Prefer an official Segger free download, and choose the latest version compatible with your system rather than simply the newest release.
3. Install the software. Run the supplied installer and follow its instructions. Connect or disconnect the J-Link device when prompted. If only driver files are provided, use Device Manager’s Update driver option and browse to the extracted folder.
4. Verify device recognition. Connect the hardware and check Device Manager under Ports (COM & LPT). Confirm that the UART interface appears without a warning icon and note its assigned COM number.
5. Test serial communication. Open your terminal application, select the assigned port, and set the baud rate and other serial parameters to match your target device. Restart Windows if the installer requests it.

Keep the driver updated when a compatible update addresses connection problems or improves support for your setup. On older Windows versions, retain a working installer and check release notes before replacing it, since the latest version may no longer support legacy systems.