3.1 Test Secondary USB

Advanced Tests · Optional · Test the secondary USB connection with a pendant / hand controller

ℹ️

Objective: This section tests the secondary USB communication function. A pendant / hand controller is required for this test.

⚠️

NOTE: This is an optional advanced test. If you do not use a pendant / hand controller, you can skip this section.

1

Set the Controller USB Mode

Open the FluidNC WebUI command line.
Enter command: $USBCDC/Enable=Off
This sets the ESP32 side to host mode for this test. You can understand it as making the ESP32 work like a small computer.
Restart the controller if required.

Then add the following to your config.yaml to enable the secondary USB host port:

## Start USB-HOST FIRST TIME NEED SET $USBCDC/Enable=Off (test the second usb port)
uart3:
  usb_host:
    baud: 115200
## the baud almost=115200

uart_channel3:
  report_interval_ms: 0
  uart_num: 3
  message_level: Verbose
## Start USB-HOST

2

Install ESP3D Firmware on the Pendant

Connect the pendant / hand controller to your computer.
Open the ESP3D Web Installer: https://webinstaller.esp3d.io/
Install the ESP3D firmware on the pendant.
Restart the pendant after installation.

3

Set Pendant Communication

On the pendant, open Settings.
Set communication mode to Serial.
Go back to Settings, then open Setting Editor.
Set baud rate to 115200.

4

Test Communication

Connect the pendant to the controller secondary USB port.
Wait a few seconds for the connection to initialize.
If the settings are correct, the pendant should communicate with the controller normally.

🔧

Troubleshooting: If the pendant does not communicate, go to Settings → Setting Editor, set Swap RX TX to Disable, then reconnect and test again.

✓

Expected Results

The controller accepts $USBCDC/Enable=Off.
The pendant is running ESP3D firmware.
Communication mode is set to Serial.
Baud rate is set to 115200.
The pendant can communicate with the controller through the secondary USB port.

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