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Bacnet Notification Class Descriptor (ServerNCDesc)

This export descriptor exposes a station’s AlarmClass to BACnet as a Notification Class object.

You use the Bacnet Export Manager view of the BacnetExportTable to add, edit, delete, and access exported components.

A BACnet client can send a request to a BACnet controller to dynamically create this component by using either an Object Id or Object Type. Optionally, the request may simultaneously specify initial values for one or more of a specified set of component properties.

 NOTE: Only the following read-only properties qualify for initial value setting during object creation. Requests that include non-qualified properties from the client cause a request to fail.
  • Device Status Facets
  • Discovery History Type
 
  • Object Name
  • Description
  • Priority
  • Ack Required
  • Recipient List
Figure 133.   Bacnet Notification Class Descriptor properties
Image

To add this discriptor to the Export Table, expand Config > Drivers > BacnetNetwork > Local Device, double-click Export Table, click New, select Bacnet Notification Class Descriptor and click OK.

Once the discriptor is available you access its properties by right-clicking Export Table, clicking Views > AX Property Sheet and expanding BacnetNotificationClassDescriptor.

In addition to the common properties (Status and Fault Cause), this component has these properties.

Property Value Description
Alarm Class Ord text (ord) Indicates the path to the connected alarm class.
Object ID drop-down list and number (from 0 to 4194302) Identifies each device and component by the type of entity (Object Id) combined with a unique Instance Number.

For devices (controllers, instruments, meters, etc.), Instance Number must be unique within the BACnet internetwork. For components (points, schedules, analog inputs, files, groups, multi state inputs, etc.), it must be unique within the device.

Object Name text in the format name.name.name.name (default includes the entire component path in the station using period (“/) delimiters between parent.child levels) Identifies a BACnet object. This name should be unique within this specific device.

For components, this name includes the entire component path under the station’s Config using period (.) delimiters between parent.child levels. This enforces (externally) the BACnet requirement for unique names for all objects in a device.

For a proxy point, this is the default name in the station.

You can shorten or edit Object Name, however, each Object Name must be unique among all server descriptors under the Export Table.

Description text Adds information to more fully explain an object’s purpose, function or location.
 NOTE: After creation (adding) BACnet file descriptors, note that each descriptor also has additional properties accessible in its property sheet, along with those seen in the Add and Edit window.  
Event Saver additional properties A separate topic documents these properties.

Related Links

  • Server (Parent Topic)

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