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BacNet card VW3A21315 connected to ATV21 and the LED status is : Comm Green(ON) , ERR Red (Flashing) , How to solve this problem ?

This LED status indicates an Invalid configuration issue , to solve this problem you need to set the internal communication parameters as below :
Parameter Function Description
F800 Communication speed Set to default (1)
F801 Parity Set 1 (even)
F803 Communication error trip time Set communication time period
F829 Communication protocol Set to 4 
F851 Behaviour at communication fault Select the inverter action after communication fault.
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