FS-8700-73 BACnet MSTP Driver Manual
Page 12 of 48
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Driver Specific Map Descriptor Parameters
Column Title
Function
Legal Values
Node_Name
Name of Node to fetch data from
One of the Node names
specified in Section 0
Object_Type
(Alias = Data_Type)
Type of object. Refer to Appendix D.1 for more
information.
AI, AO, AV, BI, BO, BV, MI,
MO, MV, NC
Object_Instance
(Alias = Address)
Instance of the object on the device.
0, 1, 2, 3, …4194303
Property
The BACnet property to be read.
Refer to Appendix D.2
Data_Array_Low_Scale
*
Scaling zero in Data Array
-32767 to 32767,
0
Data_Array_High_Scale
*
Scaling max in Data Array
-32767 to 32767,
100
Node_Low_Scale
*
Scaling zero in Connected Node
-32767 to 32767,
0
Node_High_Scale
*
Scaling max in Connected Node
-32767 to 32767,
100
Length*
Used to create an array of sequential Object_Instances
on an Object_Type.
1 to max point count of
the FieldServer,
1
Array_Index*
When referencing Multistate properties, allows the
user to specify the index of the property to be read. If 1
is specified, the first one will be read, if 2 is specified,
the second will be read, etc. If 0 is specified, the driver
will return the total number (count) of array items
linked to the property. If the parameter is not
specified, a list of all items will be returned. Refer to
Appendix A.3
0 to max number of array
items in the BACnet
Property,
-
Write_Priority*
Allows the driver to specify the write priority used to
write an output.
1..16,
16
Linked_Map_Descriptors*
This parameter allows the linking of Map Descriptors to
an active read or write Map Descriptor in order to
construct
a
ReadPropertyMultiple
or
WritePropertyMultiple transaction. Refer to Appendix
A.9
The name of a previously
defined
active
Map
Descriptor,
-
Length*
When the optional Length parameter is set to a value N,
the Map Descriptor will include N consecutive instances
of the specified Object_Type. For example, if a Map
Descriptor specifies Object_Type, Address 4 and Length
3, this means that the AO instances 4, 5 and 6 will be
included in the read or write transaction. The
corresponding Data Array values are in consecutive
positions in the Data Array, starting at the specified
Data_Array_Offset.
Any positive integer that
falls between the range
of the Data_Array_Offset
and
the
Data_Array_Length
as
specified in Section 4,
-
Refer also to Appendix
A.9
Timing Parameters
Column Title
Function
Legal Values
Scan_Interval* Rate at which data is polled 0-32000,
2s
