OPENINGS & CLOSINGS:
Are specific signals transmitted by an ALARM SYSTEM that indicate whether it has been ARMED or DISARMED. Some CONTROL PANELS are capable of storing multiple user codes (normally input through the KEYPAD). Utilizing this feature, a CENTRAL STATION can usually determine who ARMED or DISARMED the system.
OUTPUT DEVICE: This refers to a family of devices used to alert building occupants or an outside agency of a fault, alarm, or trouble condition. These can include BELLS, SIRENS, KEYPADS, COMMUNICATORS, STROBE LIGHTS, BUZZERS, and PAGERS.