Before connecting your Longer laser engraver to your computer, make sure the required drivers are installed correctly. If the driver is missing or installed incorrectly, software such as LightBurn, LaserGRBL, or LaserBurn may not recognize your machine.

This guide explains how to check whether the CH340 driver is installed and how to install it on Windows and macOS. It also shows you how to verify that the driver is working after installation.

Why This Process Matters

The CH340 driver allows your computer to communicate with your Longer laser engraver. Without the correct driver, your software may not detect the machine or establish a stable connection.

Installing the correct driver before connecting the engraver helps reduce connection problems and makes setup easier.

Check the CH340 Driver

Before starting, note the following:

  • The required driver may be missing or installed incorrectly.
  • For macOS 10.15 or later, installing the CH340 driver may not be necessary.
  • Download the driver from the official link below.

https://drive.google.com/drive/folders/1Sc-TKuez-mz--38Vp6DeL-pGmQcQdHW4

Video Tutorials:

After installing the driver, verify that it has been recognized by your operating system.

Check the COM Port on Windows

1. Use the provided USB cable to connect the machine to your computer.

2. Download and install the CH340 driver (link above).A system restart may be required during installation.

3. Follow the installation instructions carefully to ensure successful installation.

  • If any error messages appear during installation, please contact Longer Technical Support.

4. Open Device Manager to confirm that the driver is correctly installed:

  • Right-click on “This PC” → “Manage.”
  • Select Device Manager, then expand Ports (COM & LPT).

If you can see CH340 listed (e.g., “USB-SERIAL CH340 (COM3)”), your device has been successfully recognized by the computer.

Check the Driver on macOS

1. Use the provided USB cable to connect the machine to your computer.

2. Download and install the CH340 driver (link above).A system restart may be required during installation.

3. Follow the installation instructions carefully to ensure successful installation.

  • If any error messages appear during installation, please contact Longer Technical Support.

4. Restart your computer, then go to:

  • System Preferences → Security & Privacy → General → Allow

5. Allow the CH340 driver to load.

  • A system restart may be required—please follow the on-screen instructions.

Reconnect your device. At this point, software such as LaserBurn, LightBurn, or LaserGRBL should be able to detect your device.

If the “Allow” button does not respond, follow the steps below for a manual solution.

Manual Loading(if "Allow" doesn't work)

1. Open Terminal from Go → Utilities → Terminal

2. Copy and paste the following command into Terminal:

  • sudo kextload /Library/Extensions/usbserial.kext/

3. Press Enter. If prompted for a password, enter your computer’s user password and press Enter again.

4. When the command executes successfully, a confirmation message will appear in the Terminal window.

FAQ

1. Do I need to install the CH340 driver?

In most cases, yes. However, for macOS 10.15 or later, the driver may not be required.

2. How do I know whether the driver is installed?

On Windows, open Device Manager and check Ports (COM & LPT). If you see USB-SERIAL CH340, the driver is installed correctly.

3. Why can't my software detect the machine?

Check that:

  • The USB cable is connected securely.
  • The CH340 driver is installed.
  • The machine is powered on.
  • The correct COM port is selected.

Final Thoughts

Installing the correct CH340 driver is an important step when setting up your Longer laser engraver. It allows your computer and laser software to communicate correctly.

After installation, check that the driver has been recognized before opening LightBurn, LaserGRBL, or LaserBurn. On Windows, confirm that the CH340 COM port appears in Device Manager. On macOS, make sure any required security permissions have been approved.

If the driver is installed correctly, your software should detect the machine normally. Following these steps can help prevent common connection problems and ensure reliable communication with your Longer laser engraver.

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