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RS232 Toolboard Wiring and Configuration Method

  • RS232 Reference Wiring
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Interface Configuration Instructions

Precautions​

Important Preparations
  1. Firmware Requirement:
    The tool board must be flashed with RS232 firmware, otherwise communication will not be possible.
  2. Mandatory Common Ground:
    ⚠️ Before connecting the tool board, ensure it shares the same power source as the C8P or connect the tool board's GND to the mainboard's GND (using the same 24V/12V power supply will achieve this).
  3. Interface Characteristics:
    • The dual RS232 interfaces support independent or simultaneous use.
    • The Klipper serial: parameter is hardware-fixed and cannot be modified.

Wiring Specifications​

  • Wiring method for the left interface (SERIAL3)
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  • Wiring method for the right interface (SERIAL4)
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Configuration Steps​

  1. Edit printer.cfg 
    [mcu Laser]
    serial: /dev/serial3  # Fixed device node for the left interface
    baud: 250000
    restart_method: command
  2. Key Settings Explanation
    • Laser in [mcu Laser] can be customized.
    • /dev/serial3 is the dedicated node for the left interface and cannot be changed.

Configuration 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, type 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 enter and find printer.cfg.
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  • For mainsail: Machine, click to enter and find printer.cfg.
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  1. Fill in the corresponding ID.
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  1. Apply Configuration

    • After pasting the configuration code into the corresponding area,
    • Click the SAVE & RESTART button in the upper right corner.

  2. If Klipper reports ADC out of range, this is normal. Connect the heated bed and thermistor to the mainboard, configure the thermistor pins for the hotend and heated bed, then save and restart.

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