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Tool Board ID Reading and Viewing

  • Please check whether the DIP switch is set to CAN mode.
  • Ensure that the resistance between CAN H and CAN L, measured with a multimeter while powered off, is around 60Ω. If it is 120Ω, turn on the 120Ω DIP switch; if it is around 40Ω, turn off the DIP switch.
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  • Before searching for the ID, connect the tool board to a UTOC or a mainboard with bridge firmware using an XT30 data cable. Below is a reference wiring diagram.
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    Complete Guide to CAN Toolboard Setup​

    Preparations​

    Important Prerequisites
    • Toolboard Status: Ensure the toolboard is flashed with Klipper-can firmware or is in Katapult-can mode.
    • Important Note: This tutorial is only for searching for Toolboard IDs. It is not applicable for searching for Mainboard IDs.
    • Connection Requirement: The toolboard must be connected to one of the following devices:
      • A UTOC module
      • A mainboard flashed with USB-to-CAN Bridge firmware
    • Final Connection: The aforementioned device must be connected to the host computer.

    CAN Network Configuration Requirements​

    • Default Configuration: This tutorial assumes the CAN network is already configured on the host computer.
    • Fly Users: If using a Fly host computer running the Fly-FAST system, CAN is configured by default (rate: 1Mbps).
    • First-Time Users: Please be sure to read the tutorial below first: CAN Configuration Tutorial

    Connect via SSH​

    • Log in to SSH over the network (Do not use serial port login).
    • Ensure the host computer is properly connected to the CAN network device.

    Search for CAN ID​

    • Search command for a standard host computer: 
      ~/klippy-env/bin/python ~/klipper/scripts/canbus_query.py can0
    • Search command for a FLY host computer: 
      python3 ~/klipper/scripts/canbus_query.py can0

    Search Result Explanation​

    CANID
    • Important Note: The mainboard ID has already been configured in Klipper in previous documentation. Under normal circumstances, the mainboard's CANID cannot be found in the search.
    • Quick Verification Method: If confirmation is needed, first disconnect the CAN cable between the mainboard and the toolboard, then re-run the search.
    • After executing the search command, the following situations may occur:
    Result DisplayStatus DescriptionNext Steps
    Application: KlipperDevice is flashed with Klipper firmwareThis ID can be used directly.
    Application: CANBOOT or KatapultDevice is in Bootloader modeKlipper firmware needs to be flashed before use.
    Total 0 uuids foundNo devices foundPlease check the following issues:
    1. Is the CAN network configured correctly?
    2. Is the CAN rate consistent? (Default: 1Mbps)
    3. Is this ID already used in the configuration? (You need to comment it out, save, power off, and restart.)
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    About Duplicate IDs

    If a device ID is already configured in printer.cfg, it will not appear in the search results. To search for it again, please:

    1. Comment out that device ID in the configuration file.
    2. Save the configuration and restart Klipper.
    3. Power off and restart all devices.

    Configure CAN Device ID​

    1. Obtain the Configuration File​

    Locate the printer.cfg configuration file based on the web interface you are using:

    Fluidd
    Click the {...} icon in the left navigation bar, then find printer.cfg.

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    Mainsail
    Click Machine in the top navigation bar, then find printer.cfg.

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    2. Add Device Configuration​

    Add the toolboard configuration to printer.cfg:

    [mcu toolboard]
    canbus_uuid: <Enter the queried ID here>
    Configuration Note
    • toolboard is the name of the toolboard. Please modify it according to your actual situation.
    • For a mainboard ID, the configuration section should be [mcu].
    • In a normal configuration, the mainboard uses [mcu], and toolboards use [mcu toolboard].

    3. Save and Restart​

    1. Click the SAVE & RESTART button in the upper right corner.
    2. The system will automatically save the configuration and restart Klipper.
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    Note

    All IDs appearing in this document are examples. The actual ID for each mainboard/toolboard is different. Please modify and fill in based on the ID you actually obtain.

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