Interface Functions

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UTOC-1 Wiring Instructions

• CAN Interface (XH2.54-4P)
  Connect CAN devices via the onboard XH2.54-4P connector. This interface provides a 5V power output for powering external CAN devices.
  Note: This interface already has an integrated 120Ω termination resistor jumper; no external resistor is required.

• Power & CAN Combo Terminal (KF128-5.0-4P)
  The board features two KF128-5.0-4P screw terminals. Each terminal provides both VCC power input and CAN interface functionality, offering flexibility based on wiring needs.

  • Pin Definition (using one as an example):

    Pin	Function	Description
    1	VCC	12-24V Power Input (Max 24V)
    2	GND	Power Ground
    3	CAN_H	CAN Bus High-Level Signal
    4	CAN_L	CAN Bus Low-Level Signal

  • This terminal supports direct connection to a 12-24V DC power source while providing CAN bus connection, suitable for scenarios requiring simplified wiring.
  • Note: This interface already has an integrated 120Ω termination resistor jumper; no external resistor is required.

• VCC Power Input Interface
  Supports connection to a 12V-24V DC power source (maximum input voltage 24V), specifically for powering external CAN devices.
  Note: Ensure correct power polarity; do not reverse the connection. This interface only supplies power externally and does not affect UTOC-1's own power.

• GND Grounding Interface
  It is recommended to connect this interface to the machine's metal frame or the power supply's GND (choose one connection point) to provide a good grounding reference. This effectively reduces signal interference and ensures stable communication.

• External Independent Power Supply Option
  The CAN tool board can also be powered independently using its own power interface, without relying on the 5V or VCC power provided by UTOC-1. In this case, be sure to connect the external power supply's GND to UTOC-1's GND to ensure a common signal ground.

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UTOC-3 Wiring Instructions

UTOC-3 is a multi-functional CAN tool board expanded from UTOC-1. It is fully compatible with UTOC-1's functions and additionally features two USB Type-A female ports for conveniently connecting devices that lack a CAN transceiver but have a CAN controller integrated into their main control chip.

• USB Female Ports (Two)
  These two standard USB-A female ports are used to connect devices that lack a CAN transceiver but whose main control chip has CAN controller functionality (e.g., STM32 development boards). Simply use a USB Type-C cable with data transfer capability to connect the mainboard to any USB female port on UTOC-3.

  Prerequisites:

  • The USB interface pins (D+, D-) of the target mainboard must be connected in hardware to the main control chip's CAN controller pins (e.g., PA11, PA12 on STM32). Please consult the mainboard schematic for confirmation.
  • In the mainboard's firmware, the CAN function must be enabled, and the corresponding pins must be configured for CAN mode (e.g., PA11 as CAN_RX, PA12 as CAN_TX for STM32). Due to the wide variety of mainboard models, users must set specific compilation parameters according to their product documentation.

  Connection Method:

  1. Ensure the mainboard is flashed with correctly configured firmware.
  2. Use a standard USB Type-C data cable. Connect one end to the mainboard's USB port and the other end to a USB female port on UTOC-3.
  3. No additional drivers or jumpers are required. UTOC-3 will connect the mainboard's CAN controller signals to the CAN bus.

  Notes:

  • Please use a Type-C cable with data transfer capability (charging cables may lack data wires and cannot communicate).
  • It is recommended to use shielded cables and properly ground the shield to enhance noise immunity.