Honeywell Spyder 5 User Manual page 62

SPYDER MODEL 5 ENGINEERING TOOL – USER GUIDE
BACnet-MSTP
BACnet Device A
Physical Output Point
Value Point
SOURCE / TARGET
Fig. 10. Data Exchange via Dropping of Physical Output Point or Value Point
Example: There are two controllers (A and B) in two different rooms on the BACnet MSTP bus. Controller A has an outside
air temperature sensor connected. The outside air temperature value sensed by controller A should be provided to
controller B.
There is a 3 party BACnet MSTP wall module connected to an IRM controller which should process values coming from
rd
the wall module.
Read / Write Directions
A reference input point (target) is used for reading a value from a physical or value BACnet point (source)
A reference output point (source) is used for writing a value to a physical or value point (target).
There are two ways for applying reference points in the application:
•
Manual creation and mapping of reference points to BACnet points (A)
• Automatic creation and mapping of reference points via Drag & drop of BACnet points (B)
COV and Polling
The controller that contains the reference point subscribes to the mapped physical or value point if COV reporting
possible. If COV reporting is not possible, it polls the mapped physical or value point.
Manual Reference Point Creation and Mapping
The reference input-BACnet point connection is established by manual creation and mapping of the reference input
point (target) to the physical or value BACnet point (source).
The reference output connection is established by manual creation mapping of the reference output point (source) to
the physical or value BACnet point (target).
31-00282ES-01
Value (Write)
Value (Read)
Dropping**
Device Instance
Object Instance
Object ID
(Automatically )
**
resulting reference point type is selectable
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BACnet Device B
REFERENCE INPUT
or**
REFERENCE OUTPUT
SOURCE / TARGET