If the literature is vague, to determine NC or NO use a multi-meter in continuity mode.
When fully wired and secure (no motion), if you have continuity it is NC if you don't you either have a wiring problem or it is NO.
To determine the latter, make the zone not ready (move) and check for continuity.
If you have continuity, the wiring is OK and it is a NO sensor.
As posted above, a zone reading of 254 indicates an open circuit, so it is most likely a NO sensor.
Wire the EOL across the zone contacts, in parallel.
Most fire and occupancy sensors are NO, most burglary sensors, including motion sensors, are NC.