WindO/I-NV4 User’s Manual 3-101
7 BACnet Communication
3
Communication
The MICRO/I implements the COV function by sending the Confirmed COV Notification service or Unconfirmed COV
Notification service to the report requesting BACnet device according to the parameters contained in the report
request when that report request (Subscribe COV service) was transmitted from the BACnet device.
The key parameters contained in the report request are as follows.
The following diagram shows when the MICRO/I has received a report request transmitted from a BACnet device like
that in the following table.
Parameters Description
Monitored Object Identifier Type and ID of object for which to enable the COV function.
Issue Confirmed Notifications
Selects whether or not to confirm messages that will be sent from the MICRO/I to
the BACnet device.
•With confirmation (ConfirmedCOVNotification)
•Without confirmation (UnconfirmedCOVNotification)
Lifetime
The time to enable the COV function in 1 sec increments.
If 0 or omitted, the COV function is enabled with no time limit.
Report Request Parameters Description
Monitored Object Identifier Analog Input object (instant number: 10)
Issue Confirmed Notifications With confirmation (ConfirmedCOVNotification)
Lifetime 360 sec
BACnet device
MICRO/I
Report request
360 sec
(Lifetime)
(To report requester)
Present_Value of AI-10
has changed to 15.0.
Status_Flags is { }.
Present_Value of AI-10: 10.0
COV_Increment: 3.0
Status_Flags: { }
Present_Value of AI-10 has changed to 15.0
(Change in Present_Value (5.0) > COV_Increment (3.0))
Status_Flags of AI-10 has changed
Present_Value of AI-10 has changed
Status_Flags of AI-10
has changed to {FAULT}.
The maximum number of COVs that can be registered is 256.
For details on the parameters in a response request, refer to "BACnet Building Automation Data
Communication Protocol", a book published by the Institute of Electrical Installation Engineers of Japan.
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General