Possible cause
1.Is the power supply AC220V 50Hz?
2.Is it powered?
3.Whether to open the switch
4.Has the serial port been connected to the engraving machine with a serial cable, and the connection is stable?
5.Is the software's output port setting consistent with the actual connection?
6.Whether to send the correct data format to the engraving machine

Solution
1.Plug in the engraving machine and turn on the switch
2.Press the start button to send a legal file containing the content you want to engrave

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