Per-diem DD nursing

Hi there. I was just wondering if anyone could tell me a brief job description of a per-diem RN position in an residential agency setting for DD adults, would entail? I have been home with kids for 5 years & want to get back to work per-diem. I have an interview for the position mentioned above, but the job description appears to be for a full time RN (extremely extensive). Any feedback would be greatly appreciated. The position is in NY. I also have 6 years experience in this field, but as direct care staff (aide).