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how can serial port take over the control when ethernet is fail in my system

I am developing communication between Controller(cFP2101), Computer( having XP and Lab view 8.5) & IO rack (1808). I have all things on ethernet and also on serial communication too. I want to switch from one mode of communication to other mode when there is falt on any one network.

For Example:

my Ethernet cable is failed then I want to shift all my communication on serial communication and vice versa.

 

Waiting for your reply...................

 

 

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