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Tip
  • The SB2040 comes pre-flashed with Katapult firmware for CAN connection at a rate of 1M
  • The Katapult firmware for SB2040 CAN connection supports rates of 500K and 1M, which can be re-flashed if needed
  • Katapult Firmware Flashing

Firmware Flashing Instructions

  • The SB2040 can be connected to the host via CAN connection
  • CAN requires the use of XT30(2+2)-F for connection
  • Below is the style of the XT30(2+2)-F data cable
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Note
  • Mainboard firmware flashing requires using Katapult to flash Klipper
  • If you confirm that the mainboard has already been flashed with Katapult, there is no need to proceed with the Katapult firmware flashing at the end

How to Determine Which Firmware You Need​

  • The SB2040 can only connect to the host via CAN
  • CAN Firmware Flashing
    • Advantages: If the Katapult firmware has been flashed, you can update the firmware without touching the mainboard, and it supports bus connections
    • Disadvantages: Using it with KlipperScreen may cause errors such as homing timeout
    • Tip: If you need to use CAN, make sure the host supports CAN, and you need to use a UTOC or a mainboard flashed with bridge firmware

Katapult Firmware Instructions​

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 DFU or similar methods, one-click firmware updates can be performed using commands.
  • Advantages: Quickly double-press the reset button or power cycle twice to enter Katapult firmware, during which the LED on the motherboard 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 machine, with each method’s firmware being independent of the others:
    • CAN connection
      • Advantages: After compiling the Klipper firmware, it can be updated directly using commands; strong anti-interference capability.
      • Disadvantages: The firmware compilation speed must be known in advance.
    • RS232 connection
      • Advantages: After compiling the Klipper firmware, it can be updated using commands; very strong anti-interference capability.
      • Disadvantages: One-click firmware updates via commands are not possible; manual entry into Katapult firmware is required.
    • USB connection
      • Advantages: After compiling the Klipper firmware, it can be updated directly using commands.
      • Disadvantages: Long data cables are prone to interference, potentially causing disconnection.
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