How to check the driver and install it

Before using your Longer laser engraver, make sure the required CH340 driver is installed correctly. A missing or incorrect driver may prevent your computer from recognizing the machine in LightBurn, LaserGRBL, or LaserBurn.

This guide shows you how to check whether the CH340 driver is installed, how to install it on Windows and macOS, and how to confirm that your computer detects the device successfully.

Quick Answer

To install the CH340 driver:

1. Download the correct driver.
2. Install it on your computer.
3. Restart your computer if prompted.
4. Connect your Longer device using the supplied USB cable.
5. Check that the driver is recognized.
6. Open your laser software and confirm that the machine is detected.

Check the CH340 Driver

Before you begin, note the following:

• The required driver may be missing or installed incorrectly.
• For macOS 10.15 or later, the CH340 driver is not required.
• Download the CH340 driver from the official website: https://www.wch.cn/downloads/CH341SER_EXE.html

Video Tutorial：

1. How to install CH340 driver of LightBurn for MacOS Sequoia system: https://www.youtube.com/watch?v=JX-XsjLFei0

2. How to install CH340 driver of LightBurn for MacOS system: https://www.youtube.com/watch?v=FBd1uEA9QUw

After the installation is complete, check the COM port.

Install and Check the Driver on Windows

Step 1. Connect the Machine

Connect your Longer laser engraver to your computer using the supplied USB cable.

Step 2. Install the CH340 Driver

Download and install the CH340 driver. You may need to restart your computer during the installation process. Follow the installation instructions to complete the process. If an error message appears, contact support@longer.net.

Step 3. Verify the Driver

1. Open Device Manager:

• Right-click This PC and select Manage.
• Open Device Manager, then expand Ports (COM & LPT).

2. Look for a device such as:

• USB-SERIAL CH340 (COM3)

Install and Check the Driver on macOS

Step 1. Connect the Machine

Connect your Longer laser engraver to your Mac using the supplied USB cable.

Step 2. Install the CH340 Driver

Download and install the CH340 driver. You may need to restart your computer during the installation process. Please follow the installation instructions to ensure that the driver is installed successfully. If an error message appears during installation, please contact Longer Technical Support.

Step 3. Allow the Driver

After restarting, open:

• System Preferences → Security & Privacy → General
• Click Allow if the system prompts you to approve the CH340 driver.

The system may ask you to restart your Mac again. Follow the on-screen instructions.

Step 4. Verify the Connection

Reconnect the USB cable:

• Open LaserBurn, LightBurn, or LaserGRBL.

Expected Result:

• The software detects your Longer laser engraver.

Manual Driver Loading for macOS

If the Allow button does not respond, you can load the driver manually.

1. Open Terminal by following this path: Go to > Utilities > Terminal

2. Copy the following command and paste it into your terminal:

• sudo kextload /Library/Extensions/usbserial.kext

3. Press Enter (if a password command appears, enter your computer user password and press Enter again)

4. After the command is executed successfully, the following display will appear in the terminal

Conclusion

Installing the correct CH340 driver is an important part of setting up your Longer laser engraver. After installation, verify that your computer recognizes the device before opening LightBurn, LaserGRBL, or LaserBurn.

If the driver is installed correctly, your software should detect the machine and be ready for use. If not, check the USB connection and repeat the driver verification steps.