North Indians aren’t treated any differently in NIT Trichy. Students at the institute are friendly. You will get to meet many like-minded people on campus. Try to interact with everyone and not only people from North India.
The localities such as hostel gatekeepers, and shop owners are supportive. They understand that you are from a different region and may have trouble communicating.
There is no discrimination against North-Indians in NIT Trichy. My brother is currently studying in NIT Trichy and being a North Indian he describes his experience as follows.
However, you may face some minor instances where you can feel underprivileged, but remember only rough seas make skillful sailors. This is quite normal to feel in such a way whenever you are away from your home. So, throw that fear away and try to make the most of your stay there.