I had previously configured my cameras to trigger a Hikvision NVR to record when the PIR sensor was triggered on a camera. I have now moved on to Blue Iris since I moved beyond the 8 cameras my NVR could support.

I Started by enabling Camera’s digital input or motion alarm, and Trigger until reset, but I couldn’t get the alerts to work.

Turns out, enabling this same functionality with Blue Iris is just as confusing as the Hikvision NVR. In order for BI to detect the event coming from the camera, Enable Pan/Tilt/Zoom and other controls (focus, brightness, etc) has to be enabled for the camera

After this I was able to get PIR events coming from the camera!