Communication issue Agilent 1200 DAD with software

Hi

 

I have bad communication between Agilent HPLC 1200 DAD and  Empower 3 software

 

The  problem is The Empower can be connected to Agilent HPLC after many trials of restart of the computer and also restart of  Agilent LC many times until the communication established between them, and all dip switches of Agilent DAD are set to zero, and this communication issue was occurred before with Open lab software, I tried to change the computer but the communication issue still exist 

 

SO, Is there any suggestion to resolve this communication issue?

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