New Feature:
GRBL Offline Work is Ready!
No more worries about disconnected connection, Click here learn more
¶ What is the GRBL Connection Bridge?
The GRBL Connection Bridge is a software feature included in NEJE's Windows version control software. It provides the following capabilities:
- Allows your NEJE device to connect to LightBurn software via Bluetooth.
- If there is a communication failure, it won't result in the loss of task progress and can resume from where it left off.
- Automatically corrects communication data errors without affecting the work tasks.
¶ Supported Devices
It is compatible with only NEJE 3/4/5 series devices.
It is supported exclusively by the Windows version of NEJE control software.
¶ How Does It Work?
The principle behind the GRBL Connection Bridge is that GRBL data is no longer sent directly from LightBurn to the NEJE device. Instead, it is first sent to the NEJE control software, which then forwards the data to the NEJE device through either USB or Bluetooth.
To make LightBurn send data to the NEJE software, you need to use a virtual serial port software. After installing this software, it creates a virtual serial port pair, and data sent to one port will be received on the other.
¶ What is Reliable Mode?
Reliable Mode is a new feature introduced in GRBL version 2.0.0.
It primarily addresses the unreliability of GRBL streaming transmission.
Traditional GRBL streaming transmission has the following issues:
- Disconnecting USB stops the work and progress cannot be recovered.
- It cannot correct transmission errors.
Communication with GRBL is no longer pure data streaming; instead, the data to be transmitted is packaged, with added packet numbers and CRC checks. Lost or erroneous data is retransmitted.
¶ How to Use the GRBL Connection Bridge:
¶ Install virtual serial port software.
click here Download 32-bit (x86) software
click here Download 64-bit (x64) software
Install the software with the default options, and it should be ready for use without additional steps.
¶ Use the Connection Bridge in the NEJE control software
¶ Common Issues:
¶ Virtual COM Port Pair NOT Ready
Try the following steps:
Close the NEJE software.
Run setupg.exe（C:\Program Files (x86)\com0com）
Delete existing virtual serial port pairs until you have an empty list.
An empty list, as shown below
Follow the steps to create a new serial port pair.
The image below shows the correct result
Note: On my computer, it is COM9 and COM10. On your computer, it may be different, such as COM3 and COM4. These are all available and correct.
¶ Bluetooth Takes Longer?
Bluetooth connections have a slower data rate. While it suffices for cutting modes, it can take more time for large data sets, such as grayscale mode. It's advisable to use a USB connection for large data transfers.
¶ Important Notes:
Ensure that you've updated your firmware to the latest version to support Reliable Mode.
Bluetooth transmission speed and reliability are not as high as USB. For long tasks, it's recommended to use USB mode.
After enabling Reliable Transmission Mode, a yellow LED on the mainboard will light up, indicating that it's not the traditional GRBL mode. In this mode, you cannot directly connect your device to LightBurn. You need to exit Reliable Transmission Mode or restart your device to connect it to LightBurn directly.