WindO/I-NV4 User’s Manual 3-99
7 BACnet Communication
3
Communication
● Read Property Function
In the Read Property function, the MICRO/I returns the value of a property when there is a read property request
from a BACnet device. This function is implemented using DS-RP-B (Data Sharing Read Property B) and DS-RPM-B
(Data Sharing Read Property Multiple B).
The below diagram shows a BACnet device reading the analog input value of the MICRO/I that has been associated
with the Analog Input object.
●
Write Property Function
In the Write Property function, the MICRO/I writes a value to the property of an object when there is a write property
request from a BACnet device. This function is implemented using DS-WP-B (Data Sharing Write Property B) and DS-
WPM-B (Data Sharing Read Property Multiple B).
The below diagram shows a BACnet device changing the analog output value of the MICRO/I that has been
associated with the Analog Output object.
BACnet objects
BACnet device
Device addresses Physical input
Analog Input
object
Present_Value:
10.0
#D0000: 1000
Coefficient: 0.01
External
analog input:
10 V
Reflected
CH0: 10 V
Read value:
10.0
MICRO/I Analog input module
Read from BACnet device Write value of data register
BACnet objects
BACnet device
Device addresses Physical input
Analog
Output object
Present_Value:
20.0
#D0000: 1000
Coefficient: 0.02
External
analog output:
20 mA
Reflected
CH0: 20 mA
Write value:
20.0
MICRO/I Analog output module
Write from BACnet device Read out to data register
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