这个功能需要拿手操器来测试第一，设置$USBCDC/Enable=Off ，设置你现在的esp32为主机（你可以理解为一台电脑）第二，下载https://webinstaller.esp3d.io/这个固件在手操器上方便操作第三，手操器里面选择setting，选择通信模式为serial，再回到setting，选择setting editor，选择 swap RX TX 为 disable 第四，setting 里面的 baud rate 设置为 115200 这样就可以通信上了

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.

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 Swap RX TX to Disable.
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.

✓

Expected Results

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

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