Daisy-chained topology
A type of network topology in which devices are connected to each other in a continuous string without interruption. The wire terminations begin at one device and continue to branch to each subsequent device until the last device on the line is reached.
Dashboard
A window in the Metasys UI software that organizes and presents Metasys information in an easy-to-interpret, modular way. Examples of dashboards in the Metasys
Dashboards Manager
A feature in the Metasys UI that you use to customize dashboards. You can customize the widgets that appear, the order the widgets appear, and the size of the widgets. The Dashboards Manager is only available on computer platforms.
DDA
Destination Delivery Agent. A method of routing and delivering event messages to destinations such as pagers, printers, e-mail, and SNMP management systems.
Demilitarized Zone (DMZ)
The portion of a network located between the Internet and the intranet and protected by one or more firewalls.
DHCP
Dynamic Host Configuration Protocol. DHCP is a set of communications rules that allows a network administrator to automatically assign IP addresses as needed when devices are plugged into a network. DHCP enables dynamic IP network configuration and IP addressing.
DLK
The DLK0350 is the next-generation model of the Local Controller Display that succeeds the DIS1710. The DLK0350 is a remote-mountable color display that attaches to the SA Bus of an SNC or equipment controller. The DLK0350 facilitates convenient local monitoring and adjusting of set points and control parameters.
DLLR
Demand Limiting/Load Rolling. Software features that help customers save money on energy costs. Demand Limiting (DL) selectively turns off (sheds) equipment, such as fans and lights, or adjusts setpoints to limit energy use during peak times. Load Rolling (LR) reduces overall energy consumption continuously by shedding unnecessary loads.
Domain Name System (DNS)
The method by which host domain names are located and translated into IP addresses. A domain name is a meaningful and easy-to-remember handle for an Internet address. DNS is the Internet standard for naming and locating host devices and mapping host names to IP addresses. An example of a DNS handle is www.johnsoncontrols.com.
DP
Dew Point. The dew point is the temperature at which water vapor reaches the saturation point; that is, 100% humidity.
DSN
Data Source Name or Domain-Subnet-Node in LonWorks networks.