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FS-8704-06 BACnet IP Driver Manual Page 10 of 57

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5.3.2 Driver Specific Map Descriptor Parameters

Section Title

Map Descriptors

Column Title

Function

Legal Values

Node_Name

Name of remote Server Node.

One of the Node_Names

specified in Section 5.2

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.3

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.10

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.10

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