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Motherboard Precautions

Host Computer Connection Instructions​

Core Connection Limitation

The Fly-D8 motherboard can only communicate with the host computer for Klipper via the Type-C USB interface.

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Connection Requirements:

  • Use a high-quality Type-C data cable to ensure stable data transmission.
  • It is recommended to avoid using excessively long data cables (not exceeding 1.5 meters).
  • Connect to a standard USB-A port on the host computer.

USB Interface Function Description​

Integrated Architecture Description​

Functionally Independent, Physically Integrated

The RS232 serial port and USB expansion function on the Fly-D8 motherboard are two completely independent functional modules, only physically integrated onto the board.

The Fly-D8 motherboard is equipped with two USB interfaces, each with different functions:

1. Type-C USB (Host Interface)​

  • Function: Dedicated for connecting to the host computer.
  • Power Switch: Next to it is the USB-5V>EN switch, used to control the 5V power output of the Type-C interface.
    • Pressed: Turns ON the 5V output from the Type-C interface (can power the host computer).
    • Popped Up: Turns OFF the 5V output from the Type-C interface.
Host Connection Recommendation

For regular use, it is recommended to keep the USB-5V>EN switch popped up (5V output OFF) to avoid:

  1. Conflict with the host computer's own 5V power supply.
  2. Potential power backflow issues.
  3. Protecting the host computer's USB interface.

Only press the switch (turn 5V output ON) when the host computer requires additional power from the Type-C interface.

2. USB-A (Device Expansion Interface)​

  • Function: Used for expanding peripherals, supports connecting:
    • USB cameras
    • USB drives/storage devices
    • Other standard USB devices
  • Independent Module: The USB expansion function is a completely independent module, only physically integrated onto the motherboard.

USB/RS232 Mode Switching​

Function Selection Description​

The Fly-D8 motherboard uses a DIP switch to select between the USB expansion function or the RS232 serial port function on the same physical interface.

DIP Switch Settings​

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DIP DirectionFunction ModeCorresponding InterfaceTypical Use
RightUSB Expansion ModeUSB-A Interface ❷Connect cameras, USB drives, etc.
LeftRS232 Serial ModeRS232 Interface ❸Connect RS232-compatible toolboards

Mode Switching Precautions​

  1. Mutually Exclusive: USB expansion and RS232 serial port functions cannot be enabled simultaneously; only one can be selected.
  2. Firmware Match: When using RS232 function, the toolboard must support RS232 communication and have the corresponding RS232 firmware flashed.
  3. Independent Modules: The RS232 serial port and USB expansion are two independent functional modules, only physically integrated onto the motherboard.

Common Issues and Troubleshooting​

Issue 1: Host Computer Cannot Recognize D8 Motherboard​

Troubleshooting Steps:

  1. Confirm connection is made using the Type-C interface.
  2. Check the status of the USB-5V>EN switch next to the Type-C interface (for regular use, recommended popped up/OFF).
  3. Check data cable quality; try replacing the cable.
  4. Verify that the host computer's USB port is functioning normally.
  5. Check if the motherboard is receiving proper power.

Issue 2: USB Device Not Recognized​

Troubleshooting Steps:

  1. Confirm the DIP switch is set correctly (Right for USB Expansion Mode).
  2. Check USB device compatibility.
  3. Verify the USB device works normally on another host.
  4. Ensure the USB-5V>EN switch for the Type-C interface is popped up (5V output OFF).

Issue 3: RS232 Communication Abnormal​

Troubleshooting Steps:

  1. Confirm the DIP switch is set correctly (Left for RS232 Serial Mode).
  2. Check the RS232 cable connection; ensure TX/RX are cross-connected.
  3. Check for common ground (ensure GND connection between motherboard and toolboard).
  4. Verify the toolboard supports RS232 communication and has the corresponding firmware flashed.

Usage Recommendations​

  1. Type-C Connection: When connecting to the host, it is recommended to keep the USB-5V>EN switch popped up (5V output OFF) to avoid power conflicts.
  2. Function Selection: Choose between USB expansion or RS232 serial port function based on needs; they are independent modules.
  3. RS232 Connection: Switch the DIP switch to the Left when connecting an RS232 toolboard.
  4. USB Expansion: Switch the DIP switch to the Right when connecting USB devices like cameras.
  5. Safe Operation: All mode switching operations must be performed with the power OFF.
  6. Firmware Match: Before using RS232 function, confirm the toolboard has the RS232 firmware flashed.

Endstop Wiring Instructions​

Wiring Precautions
  • Three-wire endstop switches are extremely easy to wire incorrectly. Please ensure the wire order is correct.
  • If you are unsure about the wiring method, do NOT connect to the motherboard's 5V pin to avoid short circuits or device damage.

Standard Three-Wire Endstop Interface Pinout:

  1. Signal (Signal)
  2. GND (Ground)
  3. 5V (Power)

For more detailed wiring methods and configuration, please refer to: Various Endstop Wiring Instructions

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