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FS-8704-06 BACnet IP Driver Manual
The Node_Option parameter can be configured to enable or disable COV. An example configuration is
presented in Appendix A.8.3
For analog Server Map Descriptors the user may optionally configure a COV_Increment value to adjust the
reporting threshold. If it is not set the COV_Increment defaults to zero.
Change of Value (COV) Notifications are generated for all data objects for which a remote client has issued a
SubscribeCOV-Request. COV subscription is on a per-point basis. The SubscribeCOV-Request regulates
whether Notifications are Confirmed or Unconfirmed. The remote client may also write the COV_Increment
property in order to control the deadband for changes in analog values. The COV_Increment property can be
initialized via the configuration file by setting the COV_Increment Map Descriptor Property. The value set by
the configuration is an initial value that is loaded on startup. It would be replaced by any new value written by
the Client
Appendix A.8.2.
Notes on Intrinsic Reporting configuration:
Intrinsic Reporting is managed by Notification Class objects. At least one Notification Class object must be
configured for Intrinsic Reporting to work.
Each Data_Object that is to be monitored by Intrinsic Reporting must be linked to a Notification Class object
via the Notification_Class Map Descriptor Property. For analog points alarm limits must be set up, and for
binary points, the Input_Alarm_State must be set up.
The Notification_Class object contains properties that allow a client workstation to modify rules governing
event reporting, such as event_type, days of week, start and end times etc.
The RecipientLists are volatile, and subscriptions must be renewed on system restart.
A permanent static RecipientList may be configured directly on the FieldServer, eliminating the need for a
remote workstation to modify the RecipientList in order to receive Event Notifications. Using this option
makes the RecipientList read-only, i.e. it can then only be modified via the FieldServer config.csv file. Refer to
Appendix A.8.7
The "Event Enable" property is required for any object supporting Intrinsic Alarming. This property is
supported, but to save memory is only instantiated if a point is configured for alarming i.e. if it is set up with a
reference to a Notification Class map descriptor.
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