How to Check If the CH340 Driver Is Installed Correctly

When connecting your LONGER laser engraver to a computer, the CH340 driver plays an important role in enabling communication between the machine and software such as LightBurn, LaserBurn, or LaserGRBL.

If the CH340 driver is missing, incorrectly installed, or not recognized by the system, you may experience connection problems, such as the software being unable to detect your laser engraver.

This guide explains how to check, install, and verify the CH340 driver on Windows and macOS systems.

Step 1: Check the CH340 Driver Installation

• The connection issue may occur if the required CH340 driver is missing or improperly installed.
• For macOS 10.15 or later, the CH340 driver is already built-in and does not require manual installation.
• If installation is needed, download the driver package from the link below: CH340 Driver Download

Video Tutorials:

• How to Install CH340 Driver for LightBurn on macOS Sequoia
• How to Install CH340 Driver for LightBurn on macOS

Step 2: Verify COM Port Detection

1. For Windows Users:

1. Connect your Longer laser engraver to your PC using the included USB cable.
2. Download and install the CH340 driver. The installation may prompt you to restart your computer.
3. Follow the on-screen instructions to complete installation.If any error messages appear, please contact Longer technical support at support@longer.net for assistance.
4. To confirm successful installation: Right-click This PC, select Manage → Device Manager → Ports (COM & LPT).

If you see CH340 listed under COM ports, the system has successfully recognized your device.

2. For macOS Users:

1. Connect your laser engraver to your Mac via the provided USB cable.
2. Download and install the CH340 driver. You may need to reboot the system.
3. If installation errors occur, contact Longer technical support.
4. After restarting, go to: System Preferences → Security & Privacy → General → Allow. Approve the CH340 driver installation when prompted (you may need to restart again).
5. Reconnect your laser engraver. Now LaserBurn, LightBurn, or LaserGRBL should automatically detect your device.

If the “Allow” button does not respond, follow the terminal method below.

Step 3: Load the Driver Manually via Terminal

1. Open Terminal:

• Finder → Applications → Utilities → Terminal

2. Copy and paste the following command:

3. Press Enter:

• If prompted, enter your Mac user password, then press Enter again.

Once the command executes successfully, you will see a confirmation message in the Terminal window.

Conclusion

A correctly installed CH340 driver is essential for stable communication between your LONGER laser engraver and computer.

By checking the driver installation, confirming the COM port on Windows, or approving the driver on macOS, you can quickly resolve many connection issues with LightBurn, LaserBurn, and LaserGRBL.

Once the CH340 driver is working properly, your LONGER laser engraver will be ready for reliable engraving and cutting operations.