> For the complete documentation index, see [llms.txt](https://gathery.gitbook.io/faq/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gathery.gitbook.io/faq/the-engraving-machine-cannot-connect-to-lasergrbl.md).

# The engraving machine cannot connect to LaserGRBL

**1.Driver is missing, connection failed.**

In LaserGRBL, click to install the driver, Then restart the computer to connect.

**2.Multiple laser programs run simultaneously.**

Quit other laser software.

**3.Incorrect port number.**

Please choose the correct port number.

**4.Incorrect baud rate.**

Please select the correct baud rate in the software-115200.

**5.Data cable is not connected.**

Please check whether the data cable is connected correctly.

**6.Computer USB port problem**

Please try another USB port.