DOOR AJAR SIGNALLING DEVICE

摘要

2101060 9310622 PCTABS00022 A door phone controller (10) has a door ajar feature for alerting a user that a door (14) was left open. The door phone controller (10) accommodates the door ajar feature in several different ways depending upon how it is configured to interface with the central office line. If the door phone controller (10) is configured to interface with the central office line as an individual station, then when a door (14) is left open, the controller (10) alerts the user via auxiliary alert contacts specifically provided for activating a customer chime. When the door phone controller (10) is configured as a ring-down station, the door phone controller (10) alerts the user that the door (14) was left ajar by dialing a pre-programmed telephone number and sending a door ajar tone. If the door phone controller (10) is configured as an interface with a trunk port, then when the door (14) is left open, the controller (10) alerts the user by ringing the trunk line and also energizing the auxiliary alert contacts.