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tip
  • The SB2040 PRO comes pre-flashed with Katapult firmware for CAN connection at a rate of 1M.
  • The SB2040 PRO 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 PRO can connect to the host computer via CAN.
  • CAN connection requires 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 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.

How to Determine Which Firmware You Need​

  • The SB2040 PRO can connect to the host computer using the following methods:
  • CAN Firmware
    • Advantages: If Katapult firmware is flashed, you can update the firmware without touching the mainboard, and it supports bus connection.
    • Disadvantages: Using it with KlipperScreen may cause errors like homing timeout.
    • Note: If you need to use CAN, ensure the host computer supports CAN, and you need to pair it with a UTOC or a mainboard flashed with bridge firmware.

Katapult Firmware Instructions​

  • The SB2040 PRO comes by default with Katapult firmware for CAN connection at a rate of 1M.
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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