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A2B bus monitor shows "Bias reversed"

Category: Software
Product Number: AD2428
Software Version: A2B plugin Version 1.3.0, SigmaStudio+ Version 2.1.0, Mentor A2B bus monitor version 1.1.3

Hi,
I'm trying to bring up A2B network on a custom platform based AD2428 master transceiver. I was able to initialize A2B stack and discovered nodes on the A2B network as shown below using sample application provided in A2B stack. 

Then I connected an A2B monitor between master node and slave nodes. This time the node discovery was successful, but in A2B bus monitor it shows "Bias reversed". Do you know why it shows bias reversed, even though a2b application successfully discovered all slave nodes.