Daisy Chain: A daisy chain is a wiring scheme in which hardware devices are connected together in sequence.

Daylight Saving Time(DST): Also called summer time, DST is the practice of moving the clocks forward a certain amount of time from standard time for the purpose of saving energy through more efficient use of the daytime in the summer.

DBMS (Database Management System): A DBMS is a software that controls and manages database, and interacts with a user or an application to access data in the database.

Device: An access control device that can be controlled in the BioStar.

Device ID: A unique number given to identify each hardware device in the BioStar.

DHCP: A communication protocol used for the automatic allocation and management of settings required for TCP/IP communication.

DIP switch: A DIP switch is an On/Off switch that is used to control the behavior of a device circuit board without hardware alteration.

Disarm: The act of suspending the operation of an alarm system activated for a specific zone.

Door: A place in which a physical device for access control is installed. A spatial concept that forms the basis for access control.

Door group: A group of doors created for ease of management. Events can be monitored by the door group. A component of an access group.

Door sensor: A sensor that detects the state of the door. There are various types of states such as open, closed, held open, and forced open that can be checked.

Double mode: An authentication method where the credentials of two different individuals are entered in sequence in a limited amount of time.

Duress finger: A fingerprint chosen to generate a certain event upon fingerprint registration. If a user authenticates himself/herself with such a fingerprint, the authentication gets recorded in a log as duress fingerprint authentication. The system administrator can set a separate alarm using the log.