code/game/machinery/embedded_controller/airlock_controller.dm

AIRLOCK_STATE_INTERIOR_OPEN	Interior is open
AIRLOCK_STATE_INTERIOR_OPENING	Interior is opening actively
AIRLOCK_STATE_CLOSED	Interior and exterior are closed
AIRLOCK_STATE_EXTERIOR_OPENING	Exterior is opening actively
AIRLOCK_STATE_EXTERIOR_OPEN	Exterior is open

Define Details

Interior and exterior are closed

Exterior is open

Exterior is opening actively

Interior is open

Interior is opening actively