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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.
MICRO/I
BACnet device
Read value:
10.0
Read from BACnet device
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.
MICRO/I
BACnet device
Write value:
20.0
Write from BACnet device
BACnet objects
Device addresses
Reflected
Analog Input
object
Present_Value:
#D0000: 1000
10.0
Coefficient: 0.01
Write value of data register
BACnet objects
Device addresses
Reflected
Analog
Output object
Present_Value:
#D0000: 1000
20.0
Coefficient: 0.02
Read out to data register
WindO/I-NV4 User's Manual
7 BACnet Communication
Analog input module
Physical input
External
analog input:
CH0: 10 V
Analog output module
Physical input
analog output:
CH0: 20 mA
3
10 V
External
20 mA
3-99
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