Echelon LonMaker - Manual (Page 398)

382 Appendix G – Glossary
Disable
For a device, disabled is a device state in which the device application does not run even if the device
is reset. For a functional block, disable is a management command that causes output network
variables to send their configured default values.
Domain
A logical collection of devices on one or more channels. Communications can only take place among
devices configured in the same domain.
Domain ID
The top level of the LonTalk addressing hierarchy of domain/subnet/node. The domain ID can be 0, 1,
3, or 6 bytes long. The zero-length domain is reserved for the use of the LNS architecture and cannot
be used as the system's domain.
Download
An installation process in which data, such as the application program, network configuration, and/or
application configuration, is transferred over the network from the LNS network database into a
device.
Dynamic Data Exchange (DDE)
A standard protocol built into the Macintosh, Windows, and OS/2 operating systems. DDE enables two
running applications to share the same data. For example, DDE makes it possible to insert a
spreadsheet chart into a document created with a word processor. Whenever the spreadsheet data
changes, the chart in the document changes accordingly. When applications share information with
each other using DDE, they are said to be holding a DDE conversation. Each conversation has a well-
defined beginning, middle, and end. To begin a conversation, one application, known as the client or
destination application asks another application, known as the server or source application to open a
communications channel. Once a conversation is established, the client can send and receive data from
the server on the DDE channel. For example, an Excel spreadsheet (the client or destination) may ask
the LonManager DDE Server (the server or source) for the current fuel consumption from a flow
sensor for use in an automated billing system. Alternately, an InTouch operator interface (the client or
destination) may tell the LonManager DDE Server (the server, or source) to change the state of a valve
in a LONWORKS network in response to a request issued by the user interface.
Dynamic Functional Block
A functional block that is not pre-loaded on a device. Dynamic functional blocks are typically used by
controllers that do not have a static interface. These controllers typically require the integrator to run a
plug-in or other configuration software that defines the control algorithm and configures the controller.
The controller manufacturer can use dynamic functional blocks to enable a LonMaker user to add
functional blocks to the controller using the LonMaker tool.
Dynamic Network Variable
A network variable that is added to a functional block after the device has been commissioned.
Devices that support dynamic network variables include controllers and gateways with dynamic
interfaces.
Engineered System Scenario
An installation scenario in which configuration data is collected into the network database when the
system is being designed with the LonMaker tool and downloaded into the physical devices when the
network is installed.
Enumerated Object
A network variable, configuration property, or functional block state that has enumerated types.
Examples of enumerated objects include SNVT_hvac_mode, SCPT_hvac_type, and functional block
states enable and override.