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ADUCM350: need to help!

Hi All,

I'm new to the device and I cant figure this out. I'm trying to set my controller into Priority low setting.

It looks like it on active high.

https://ibb.co/SJyLbGD

Im trying to figure this out in the code uart.example but im not sure where to locate how to enable active low. Is it something to do with interrupt service routine?