Important Notes

Notes

• This tutorial specifically introduces wiring and searching IDs for the tool board. Related steps do not apply to the main board. Please make sure to distinguish between them.
• If you are not using a tool board, please ignore this tutorial.

Tool Board ID Reading and Viewing

Obtaining CANBus UUID

• Please note that the power cable for the tool board is not connected to the CAN port, but rather to the 12V-24V power line.

Complete Guide to CAN Toolboard Setup

Preparation

Important Prerequisites

• Toolboard Status: Ensure the toolboard has the Klipper-can firmware flashed or is in Katapult-can mode
• Scope of Application: This tutorial is only for toolboard ID search, not applicable for motherboard ID search
• Connection Requirements: The toolboard must be connected to one of the following devices:
  • UTOC module
  • A motherboard flashed with USB bridge CAN firmware
• Final Connection: The above devices must be connected to the host computer

Hardware Connection and Termination Resistor Configuration

Safety First

• Complete Power Off: All wiring operations must be performed with the equipment completely powered off
• Prevent Short Circuits: Disconnect the power supply to all devices before operating

Connection Specification Table

Device Type	Termination Resistor Requirement	Configuration Method
CAN Toolboard	Requires 120Ω termination resistor	Enable via jumper cap or DIP switch
Motherboard CAN Interface	Requires 120Ω termination resistor	Enable via jumper cap or DIP switch
UTOC Module	Already built-in 120Ω resistor	No additional connection required

Configuration and Measurement Steps

1. Hardware Configuration

   • Check if the 120Ω jumper cap or DIP switch next to the motherboard's CAN interface is connected or enabled
   • Check if the 120Ω jumper cap or DIP switch on the toolboard is connected or enabled

2. Resistance Measurement (Power-off state)

   • Measurement Point: Between CAN-H and CAN-L
   • Tool: Multimeter

Resistance Value Troubleshooting Table

Notes

• Measurements must be taken with the power off
• If the measured value reaches around 140Ω, it may indicate that CAN-H and CAN-L are reversed

Measured Value	Status	Possible Cause	Solution
Around 60Ω	✅ Normal	Resistors correctly connected at both ends	Configuration complete
Around 120Ω	❌ Abnormal	Line disconnected or not connected	Check all wiring
Around 40Ω	❌ Abnormal	Three points connected with resistors	Remove the middle resistor
Around 90Ω	❌ Abnormal	Only one end connected with a resistor	Check the jumper cap at the other end

Important Notes

• UTOC Module: Already has a built-in resistor; no additional termination resistor is required on the motherboard when connected
• Connection Scenarios:
  • Toolboard ↔ Motherboard (both ends require termination resistors)
  • Toolboard ↔ UTOC ↔ Host (only the toolboard requires a termination resistor)
• Troubleshooting Flow:

  Measure resistance → 60Ω → Normal operation
         ↓
     Abnormal value → Refer to the table above → Adjust and re-measure

Hardware Inspection Checklist

• All devices completely powered off
• Termination resistor connected at the motherboard's CAN interface (except for UTOC)
• Termination resistor connected on the toolboard
• Multimeter measures resistance ≈60Ω
• CAN-H and CAN-L wiring correct and secure

Professional Advice

Correct termination resistor configuration is critical for CAN bus communication quality. Deviations in resistance values may cause communication instability or data loss.

CAN Network Configuration Requirements

• Default Configuration: This tutorial assumes the host computer has already configured the CAN network
• Fly System Users: If using a Fly host running the Fly-FAST or Fly-Armbian system, CAN is already configured by default (speed 1Mbps)
• First-Time Use: Please read the following tutorial first: CAN Configuration Tutorial

Summary Process

1. Hardware Preparation: Wire in a power-off state, configure termination resistors, measure and confirm 60Ω
2. Network Confirmation: Ensure the host computer's CAN network is correctly configured
3. Connect to Host: Connect to the host via UTOC or USB bridged motherboard
4. Firmware Status: Confirm the toolboard is in Klipper-can or Katapult-can mode
5. Next Steps: Follow the subsequent tutorial for ID search and configuration

At this point, your CAN toolboard hardware connection and network environment are ready for ID search and configuration operations.

Connect via SSH

• Log in to SSH via the network (do not use serial port login)
• Ensure the host computer is properly connected to the CAN network devices

Search for Devices

• Now that you have successfully logged into the host computer, you can enter lsusb to search for devices. You may encounter one of the following situations:
  • If entering lsusb prompts that the ls command is not found, you can install the required utility by entering the following command:

    sudo apt-get install usbutils

  • If there is no response after entering lsusb, this is a system issue and cannot be resolved here. You will need to change the system or use a known working system.
  • If information like that shown in the image below appears, please note that this is only a reference. You only need to confirm that 1d50:606f appears:
    
• 1d50:606f is the device you will use in this instance.
• If multiple 1d50:606f devices appear, one must be excluded, as multiple entries may affect subsequent flashing and firmware connection. For example, with FLY MINI PAD, it is recommended to use the onboard UTOC and avoid using other CAN bridges.
• If the device does not appear, please check whether the data cable is properly connected and whether the correct firmware has been flashed.

Note

You can proceed to search for the CAN ID only when 1d50:606f appears.

Search for CAN ID

Fly-Armbian / General Systems

Execute the following command to search for CAN device IDs:

~/klippy-env/bin/python ~/klipper/scripts/canbus_query.py can0

Fly-FAST System

Execute the following command to search for CAN device IDs:

python ~/klipper/scripts/canbus_query.py can0

Search Results Explanation

After executing the search command, several situations may occur:

Result Display	Status Description	Next Steps
Application: Klipper	Device has Klipper firmware flashed	Can directly use this ID
Application: CANBOOT or Katapult	Device is in Bootloader mode	Needs to flash Klipper firmware before use
Total 0 uuids found	No devices found	Please check the following issues: 1. Is the CAN network configuration correct? 2. Is the CAN speed consistent (default 1Mbps)? 3. Has this ID already been used in the configuration (need to disable first, then save and restart after power off)?

About Duplicate IDs

If the device ID is already configured in printer.cfg, it will not appear in the search results. To search again:

1. Comment out the device ID in the configuration file
2. Save the configuration and restart Klipper
3. Power off and restart all devices

Configure CAN Device ID

1. Get Configuration File

Find the printer.cfg configuration file based on the web interface used:

Fluidd Click the {...} icon on the left navigation bar to find printer.cfg

Mainsail Click Machine on the top navigation bar to find printer.cfg

2. Add Device Configuration

Add the toolboard configuration in printer.cfg:

[mcu toolboard]
canbus_uuid: <Insert the ID obtained from the query here>

Configuration Notes

• toolboard is the name of the toolboard; modify it according to actual conditions
• If it's a motherboard ID, the configuration section should be [mcu]
• In normal configuration, the motherboard uses [mcu], and the toolboard uses [mcu toolboard]

3. Save and Restart

1. Click the SAVE & RESTART button in the upper right corner
2. The system will automatically save the configuration and restart Klipper

Note

All IDs appearing in this document are examples. Each motherboard's ID is unique. Please modify and fill in according to the actual ID obtained.