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Tip
  • The SB2040 V3 comes pre-flashed with the Katapult firmware for CAN connection at a rate of 1M.
  • The SB2040 V3 Katapult firmware for CAN connection is available in two rates: 500K and 1M. You can flash the one you need.
  • Katapult Firmware Flashing

Firmware Flashing Instructions

  • The SB2040 V3 can connect to the host computer using either RS232 or CAN.
  • Both RS232 and CAN connections require the use of an XT30(2+2)-F cable.
  • Below is the style of the XT30(2+2)-F data cable:
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Important Notes
  • Flashing the mainboard firmware requires using Katapult to flash Klipper.
  • If you are certain the mainboard already has Katapult flashed, you do not need to perform the final step of flashing the Katapult firmware.
  • You can quickly press the reset button twice to see if an LED on the mainboard starts blinking. If it does, it indicates the mainboard has entered the Katapult firmware.

How to Determine Which Firmware You Need​

  • The SB2040 V3 can connect to the host computer using the following methods:
  • CAN Firmware Flashing
    • Advantages: If the Katapult firmware is flashed, you can update the firmware without touching the mainboard, and it supports bus connections.
    • Disadvantages: Using it with KlipperScreen may cause errors like homing timeout.
    • Note: If you plan to use CAN, ensure your host computer supports CAN, and you need to use it with a UTOC or a mainboard flashed with bridge firmware.
  • RS232 Firmware Flashing
    • Advantages: No special software is required for use; communication is reliable and stable.
    • Disadvantages: Re-flashing the firmware requires manually entering DFU mode or double-pressing RST to enter Katapult for updates.
    • Note: It must be used with a G2T or UTOR.

Katapult Firmware Explanation​

Tip

Katapult was originally named CanBoot and later renamed to Katapult.

  • Katapult firmware is a type of bootloader that can be used in conjunction with Klipper. After flashing via methods like DFU, the firmware can be updated with a single command.
  • Advantages: Quickly double-click the reset button or power off twice rapidly to enter Katapult firmware, at which point the motherboard's LED will blink.
  • Katapult firmware can only be used to flash firmware and cannot connect to Klipper!!!
  • Katapult firmware supports three methods for connecting to the host computer, with each method's firmware being independent of the others:
    • CAN connection
      • Advantages: After compiling the Klipper firmware, the firmware can be updated directly using commands, with strong anti-interference capabilities.
      • Disadvantages: The firmware compilation rate must be known in advance.
    • RS232 connection
      • Advantages: After compiling the Klipper firmware, the firmware can be updated using commands, with very strong anti-interference capabilities.
      • Disadvantages: Firmware cannot be updated with a single command; manual entry into Katapult firmware is required.
    • USB connection
      • Advantages: After compiling the Klipper firmware, the firmware can be updated directly using commands.
      • Disadvantages: Long data cables are prone to interference, which may cause disconnections.
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