Device RTU & TCP is live testing


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What is the best way to test connectivity of RS485 and TCP devices ?

I want to test devices and if connection fails (like wire broken, radio connection lost etc ) device will be on alarm list..?

I guess that result can be added to virtual channel like 0 or 1 for each device ??

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There are lots of ways.  You can put that expression right in the LED component if that's the only place you want it.  Other people will put it in a loop they already have or create a new loop and assign the result to a global variable that the LED component accesses.  Then they can add logic as well to actually do something when comms fails like attempt to reinit the port.  

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