John Trant 
已采纳回答
已采纳回答Dxf format versions above version 04 are not compatible. I suggest you change the drawing format and use the second channel to open the DXF format file
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RDV6555G, When replacing DXF format drawings, disconnections
Please forgive my poor English. Simply, I use RDV6555G, it will disconnect when replacing the DXF format drawing. help me please.
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I have solved it, thank you for your answer.