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tip
  • The SB2040 PRO V3 comes pre-flashed with Katapult firmware for CAN connection at a rate of 1M.
  • The SB2040 PRO 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 PRO V3 can connect to the host computer using RS232 or CAN.
  • 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 mainboard firmware requires using Katapult to flash Klipper.
  • If you are sure 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 means the mainboard has entered the Katapult firmware.

How to Determine Which Firmware You Need​

  • The SB2040 PRO V3 can connect to the host computer using the following methods:
  • CAN Firmware Flashing
    • Advantages: If 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 want to use CAN, make sure the host computer supports CAN, and you need to pair it with a UTOC or a mainboard flashed with bridge firmware.
  • RS232 Firmware Flashing
    • Advantages: No special software is required to use it; communication is reliable and stable.
    • Disadvantages: Re-flashing the firmware requires entering manual DFU mode or double-clicking RST to enter Katapult to update the firmware.
    • Note: It requires pairing with G2T or UTOR to use.

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 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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