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RRF Firmware Flashing and Configuration

How to Determine if the Tool Board Supports RRF-CAN​

Some packages of the SHT36 V3 support RRF-CAN. You can determine support by checking if the tool board has an RRF-CAN chip (refer to the physical location in the image below).

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Firmware Download​

Compatibility Notice

Fly-SHT36 Max V3 only supports firmware versions 3.5.1 and above.

Download the firmware file Duet3Firmware_SHT36MAX3.uf2:

Version Matching Warning

It is essential that the firmware version of the tool board exactly matches the firmware version of the connected mainboard.

Enter and Complete Flashing​

  1. Enter Flashing Mode:

    • Ensure the tool board is completely powered off.
    • Press and hold the BOOT button (location shown below) while connecting the board to your computer via a Type-C data cable.
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  2. Perform Flashing:

    • A drive named RPI will appear on your computer.
    • Drag and drop the downloaded .uf2 file into this drive to complete the flashing process.

Connection Check and Address Configuration​

1. Power-On Check​

After powering on the printer, observe the tool board:

  • The 3.3V, 5V, and Power LEDs should be steadily lit.
  • The Status LED near the main chip will flash rapidly initially, then transition to flashing approximately once per second after a connection is established.
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2. Communication Verification​

Send a command from the host console to verify communication with the tool board (default address 124):

M115 B124

This command will return the firmware information of the tool board.

3. Setting the CAN Address​

To avoid conflicts, assign a unique address to each tool board (it is recommended to start from 20).

  • Assign a New Address (e.g., change address 124 to 20): 
    M952 B124 A20
  • Reboot to Apply: Power cycle the board, or send M999 B124.
  • Verify the New Address: 
    M115 B20
  • Multiple Tool Boards: Power on each board one at a time, and repeat the steps above, assigning a different address (e.g., 21, 22...) to each one.

4. Startup Delay Setting​

To ensure the mainboard can detect all CAN devices, add the following line at the top of the mainboard's config.g file:

G4 S2 ; Wait for expansion boards to start
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