tip

• SB2040 comes pre-programmed with the Katapult firmware for CAN connection, at a rate of 1M
• The Katapult firmware for SB2040 CAN connection has rates of 500K and 1M, you can burn it yourself if needed
• Katapult Firmware Burn

Firmware Burn Instructions

• SB2040 can connect to the host computer via CAN
• CAN needs to be connected using XT30(2+2)-F
• The following is the data cable style of XT30(2+2)-F
  

Notes

• Mainboard firmware burning needs to be done through Katapult to burn Klipper
• If the mainboard has already been burned with Katapult, there is no need to burn the Katapult firmware at the end
• 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

• SB2040 can only connect to the host computer via CAN
• CAN Firmware Burn
  • Benefits: If you have burned the Katapult firmware, you can update the firmware without touching the mainboard, and it supports bus connection
  • Disadvantages: It may cause errors such as homing timeout when used together with KlipperScreen.
  • Note: If you need to use CAN, make sure the host computer supports CAN, and you need to pair it with UTOC or a mainboard with a bridge firmware burned in

Katapult Firmware Description

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 burning the firmware using methods like DFU, you can use commands to update the firmware with one click.
• Advantage: Quickly double-clicking the reset button or quickly cutting power twice will enter the Katapult firmware, at which point there will be an LED flashing on the mainboard.
• Katapult firmware can only be used to burn firmware and cannot connect to Klipper!!!
• Katapult firmware supports three connection methods for connecting to the host computer, and the firmwares for these three methods are independent of each other.
  • CAN connection
    • Advantage: After compiling the KLIPPER firmware, you can directly update the firmware using a command, and it has strong interference resistance.
    • Disadvantage: You need to know the firmware compilation rate in advance.
  • RS232 connection
    • Advantage: After compiling the KLIPPER firmware, you can update the firmware using a command, and it has very strong interference resistance.
    • Disadvantage: You cannot use a command to update the firmware with one click; you need to manually enter the Katapult firmware.
  • USB connection
    • Advantage: After compiling the KLIPPER firmware, you can directly update the firmware using a command.
    • Disadvantage: A long data cable is prone to interference, which may lead to disconnection.