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tip
  • The SB2040 V3 comes pre-flashed with Katapult firmware for CAN connection, with a rate of 1M.
  • The SB2040 V3 Katapult firmware for CAN connection is available in 500K and 1M rates; you can flash it yourself if needed.
  • Katapult Firmware Flashing

Firmware Flashing Instructions

  • The SB2040 V3 can connect to the host computer using RS232 or CAN connection methods.
  • Both RS232 and CAN require connection using 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 motherboard firmware requires using Katapult to flash Klipper.
  • If you are certain that the motherboard 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 motherboard starts flashing. If it does, it indicates that the motherboard 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 Katapult firmware is flashed, firmware updates can be performed without touching the motherboard, and it supports bus connections.
    • Disadvantages: It may cause errors such as homing timeouts when used with KlipperScreen.
    • Note: If you need to use CAN, ensure that the host computer supports CAN, and you will need to use it with a UTOC or a motherboard 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 entering manual DFU mode to update the firmware, or double-clicking RST to enter Katapult for firmware updates.
    • Note: It requires a G2T or UTOR to be used.

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 in quick succession to enter Katapult firmware, at which point an 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 computer, 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, with strong anti-interference capability.
      • Disadvantages: Requires prior knowledge of the firmware's compiled baud rate.
    • RS232 connection
      • Advantages: After compiling the Klipper firmware, it can be updated using commands, with very strong anti-interference capability.
      • Disadvantages: Cannot update the firmware with a single command; requires manually entering Katapult firmware.
    • USB connection
      • Advantages: After compiling the Klipper firmware, it can be updated directly using commands.
      • Disadvantages: Long data cables are prone to interference, which may cause disconnections.
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