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  • J-Link debug probes
  • J-Link Configurator

    J-Link Configurator
    See emulators connected to PC

    The J-Link Configurator is a GUI application that displays a list of all emulators currently connected to the PC via USB or Ethernet.

     

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    SEGGER Debug & Trace Probes
    1. 1.Configuring J-Links via USB or Ethernet
      1. 1.1.General settings
      2. 1.2.USB identification
      3. 1.3.IP configuration
    2. 2.Updating the firmware
      1. 2.1.Updating the firmware of one or more J-Links at once
    3. 3.Licensing
    4. 4.System requirements
    5. 5.Latest news

    Managing large-scale deployments

    The J-Link Configurator makes it easy to manage multiple J-Links, such as updating the firmware of multiple J-Links at once  (see "Configuring J-Links via USB or Ethernet" below). The list of all connected J-Links is updated automatically, so it is possible to "plug and play" additional J-Links while the J-Link Configurator is running. This feature helps to expand a large deployment without resetting the application.

    In addition, J-Link Configurator displays information about the connected J-Link, such as the current firmware version, response time, number of active connections, etc. If the host loses connection to an emulator, the green status indicator turns red, making it easy to monitor many J-Links on a LAN.

    J-Link Cfg Main Window

    Configuring J-Links via USB or Ethernet

    The "Configure J-Link" dialog displays information about the selected J-Link (such as product, serial number, nickname, USB identification, etc.). The main advantage is that a user can configure multiple options of the J-Link.

    General settings

    You can specify a nickname for the selected J-Link. This makes it easier to distinguish between multiple J-Links, especially if you have a large deployment with more than 100 J-Links.

    USB identification

    The USB identification is mainly used for older J-Links that do not enumerate with their real serial number when connected to a host PC. This limits the number of J-Links that can be connected to a host PC in parallel. New J-Links are preconfigured with the "Real SN" option, which allows an unlimited number of J-Links to be connected via USB to the same PC. For older J-Links, this option allows you to reconfigure the J-Link to use the new recommended enumeration method.

    IP configuration

    IP Configuration handles how the J-Link is identified on Ethernet. The user can set up an individual IP address, subnet mask and gateway by clicking "Manual". Default configuration is Automatic (settings are received via DHCP).

    J-Link Cfg Config Dialog 1909

    Updating the firmware

    Updating the firmware of one or more J-Links at once

    J-Link Configurator enables you to easily update more than one J-Link at a time. First, select the J-Links that should receive a firmware update by checking the checkbox at the front of each row. Second, click the "Update firmware of selected emulators" button. A message box will appear asking if you really want to update the firmware of the selected J-Links. After confirming this message, J-Link Configurator will update the firmware of the selected J-Links at once. The whole update process is shown in a popup window.

    The following screenshot shows the running report that appears during a firmware update.

    While the update process is running, the "Log" shows important information for the user. In this screenshot, three J-Links have been updated.

    J-Link Cfg FW Update Dialog 1909
    J-Link Cfg FTW Update Log 1909

    Licensing

    The J-Link Configurator comes as part of the J-Link Software and Documentation Package. The software package is free for any J-Link or J-Trace device and can be downloaded here:

    DownloadJ-Link Software and Documentation Pack

    System requirements

    Supported OS
    WindowsMicrosoft Windows (x86/x64)
    macOSmacOS (x86/Apple Silicon)
    LinuxLinux (x86/x64/Arm)

    Latest news

    2025
    Jul.09
    J-Link
    J-Link devices alongside Renesas RA8P1

    SEGGER delivers J-Link and Flasher support for Renesas Electronics's RA8P1

    SEGGER's J-Link series of debug probes and Flasher programmers are now compatible with Renesas Electronics's high-performance group of RA8P1 microcontrollers (MCUs). The MCUs are powered by the Arm® Cortex®-M85 (CM85) processor with a Helium™ M-Profile Vector Extension and Ethos™-U55 neural processing unit.

    [Read more...]

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