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Reference Wiring

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Searching for the RS232 ID of the Toolboard​

Precautions​

Important Preparations
  1. Firmware Requirement:
    The toolboard must be flashed with the RS232 firmware, otherwise communication will not be possible.
  2. Mandatory Common Ground:
    ⚠️ Before connecting the toolboard, ensure its GND is connected to the mainboard's GND (using the same 24V/12V power supply achieves this).

RS232 Notes​

  • Only the D8, D8PRO, and C8P mainboards support the RS232 interface. Other mainboards do not.
  • For unsupported mainboards, use G2T or UTOR for connection.

Searching for the RS232 ID​

  1. Open a browser, enter the host's IP address in the address bar (e.g., if the host IP is 192.168.101.179, enter it and press Enter).
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  1. Open the host's WEB interface. In the left sidebar configuration options, find:
  • For fluidd: {…}. Click to find printer.cfg.
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  • For mainsail: Machine. Click to find printer.cfg.
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  1. Click printer.cfg, then click DEVICES in the top right corner.
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  1. Click SERIAL, then refresh.
  • Refreshing in fluidd.
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  • Refreshing in mainsail.
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  1. Copy the ID. Click the indicated arrow to copy.
  • In fluidd, check if ch341-uart exists, then click Path_by_hardware. This is the RS232_ID.
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  • In mainsail, check if CH341-UART exists, then click Path_by_hardware. This is the RS232_ID.
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Note
  • When connecting the toolboard using UTOR, two RS232_IDs often appear. Try each one.

Configuring the Toolboard RS232 ID​

  • Below is a reference configuration.

    Note
    • In the configuration below, toolboard refers to the toolboard name. If it has a different name, replace it accordingly.
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    [mcu toolboard]
    serial: <Replace here with the ID you just queried>
    baud: 250000
    restart_method: command
    • When adding the toolboard ID, it must be [mcu toolboard], followed by serial:, and then the toolboard ID you found.
    • Below is the reference configuration.
    • Please note this tutorial is for toolboard ID search and configuration. Normally, the toolboard should already be properly connected to the mainboard.
    • The mainboard is always [mcu], and the toolboard is [mcu toolboard].
    • Click SAVE & RESTART in the top right corner. This will automatically save and restart Klipper.
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Note: All IDs appearing in this document are examples. The actual ID for each mainboard is different. Please use the ID you actually obtained. ::​

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