FieldServer FS-8700-16 Release note

Driver Version:
1.17
Document Revision:
1
A Sierra Monitor Company
Driver Manual
(Supplement to the FieldServer Instruction Manual)
FS-8700-16 Bacnet PTP - Serial
APPLICABILITY & EFFECTIVITY
Effective for all systems manufactured after June 2009

FS-8700-16 BACnet PTP Serial Driver Manual Table of Contents
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com
Tel: [phone] Fax: [phone] Toll Free: [phone] email: [e-mail]
TABLE OF CONTENTS
1BACnet PTP Description .................................................................................................................................4
2Driver Scope of Supply ...................................................................................................................................5
2.1 Supplied by FieldServer Technologies for this Driver ....................................................................................5
2.2 Provided by supplier of 3rd party equipment.................................................................................................5
3Hardware Connections...................................................................................................................................6
4Configuring the FieldServer as a BACnet Client .............................................................................................. 7
4.1 Data Arrays/ Descriptors ...............................................................................................................................7
4.2 Setting the FieldServer Node_ID....................................................................................................................8
4.3 Client Side Connection Descriptions..............................................................................................................8
4.4 Client Side Node Descriptors .........................................................................................................................9
4.5 Client Side Map Descriptors.........................................................................................................................10
4.5.1 Driver Related Map Descriptor Parameters.........................................................................................10
4.5.2 Timing Parameters...............................................................................................................................10
4.5.3 Map Descriptor Example......................................................................................................................11
5Configuring the FieldServer as a BACnet Server ........................................................................................... 12
5.1 Driver Specific FieldServer Parameters........................................................................................................12
5.2 Data Arrays/Descriptors ..............................................................................................................................12
5.3 Server Side Connection Descriptions...........................................................................................................13
5.4 Server Side Node Descriptors ......................................................................................................................13
5.5 Server Side Map Descriptors........................................................................................................................14
5.5.1 FieldServer Specific Map Descriptor Parameters .................................................................................14
5.5.2 Driver Specific Map Descriptor Parameters .........................................................................................15
5.5.3 Map Descriptor Example......................................................................................................................16
Appendix A. Useful Features................................................................................................................................ 17
Appendix A.1. BACnet object names .......................................................................................................................17
Appendix A.2. Network number ..............................................................................................................................17
Appendix A.3. Accessing Data from BACnet Properties comprising Arrays of Values.............................................18
Appendix A.4. FieldServer implementation of BACnet priority Arrays....................................................................18
Appendix A.4.1. Accessing Priority Array information......................................................................................19
Appendix A.5. BACnet State Text Preload ...............................................................................................................20
Appendix A.5.1. Method 1 –Using an Offset/User Table:................................................................................20
Appendix A.5.2. Method 2 –Using a Single Data Array:..................................................................................21
Appendix A.5.3. Using Intrinsic Reporting for a Multistate Value....................................................................22
Appendix A.6. COV and Intrinsic Reporting .............................................................................................................22
Appendix A.6.1. Notes on COV configuration:..................................................................................................23
Appendix A.6.2. Notes on Intrinsic Reporting configuration: ...........................................................................23
Appendix A.6.3. Map Descriptor Example - COV..............................................................................................24
Appendix A.6.4. Map Descriptor Example –Intrinsic Reporting.......................................................................24
Appendix A.6.5. Map Descriptor Example - Enable or Disable COV .................................................................24
Appendix B. Troubleshooting............................................................................................................................... 25
Appendix B.1. Debugging a BACnet connection ......................................................................................................25
Appendix C. Vendor Information ......................................................................................................................... 26

FS-8700-16 BACnet PTP Serial Driver Manual Table of Contents
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com
Tel: [phone] Fax: [phone] Toll Free: [phone] email: [e-mail]
Appendix C.1. McQuay ............................................................................................................................................26
Appendix C.2. Trane.................................................................................................................................................26
Appendix C.3. Liebert ..............................................................................................................................................26
Appendix C.4. Automated Logic Corporation. .........................................................................................................26
Appendix C.5. Honeywell EBI...................................................................................................................................26
Appendix D. Reference ........................................................................................................................................ 27
Appendix D.1. Object_Type Legal Values –Abbreviation Descriptions...................................................................27
Appendix D.2. Property Legal Values.......................................................................................................................27
Appendix D.3. Units .................................................................................................................................................29
Appendix D.4. BACnet Specific Statistics .................................................................................................................32

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1BACNET PTP DESCRIPTION
The BACnet PTP driver allows the FieldServer to transfer data to and from devices using the BACnet protocol over a
serial RS-232 physical layer. The FieldServer can emulate either a Server or Client.
All information in a BACnet system is represented in terms of objects. The Object_Identifier is a 32-bit code that
identifies the type of Object (also identified by the Object_Type Property) and its "Instance" number, which
together uniquely identify the Object within its BACnet device. Theoretically, a BACnet device could have over four
million Objects of a particular type. The Object_Name is a text string, which has a unique capability. BACnet
devices may broadcast queries for devices that contain Objects with a specific Object_Name. This can greatly
simplify project setup.
BACnet requires one Device Object to be present in every BACnet device. The Device Object makes information
about the device and its capabilities available to other devices on the networks. Before one BACnet device starts
control-related communications with another, it needs to obtain some of the information presented by the other
device's Device Object. Unlike other Objects, the Device Object's Instance number must be unique across the
entire BACnet internetwork because it is used to uniquely identify the BACnet devices. It may be used to
conveniently identify the BACnet device from other devices during installation.
Standard object types are used to hold real time data and other information. Each Object Type is referenced by a
number, for example 0 represents an Analog Input.
Each Object consists of a number of prescribed properties, the main property being the Present_Value. Objects
are monitored and controlled through their properties. The Analog Input Object is representative of the Objects
involved directly with control elements and many of its Properties reflect this.
The information that follows describes how to expand upon the factory defaults provided in the configuration files
included with the FieldServer.

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2DRIVER SCOPE OF SUPPLY
2.1 Supplied by FieldServer Technologies for this Driver
FieldServer Technologies PART #
Description
FS-8917-03
Connector adapter –DB9M to DCE, RTS/CTS, DSR/DTR
2.2 Provided by supplier of 3rd party equipment
PART #
Description
BACnet Controller

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3HARDWARE CONNECTIONS
It is possible to connect a BACnet device to any of the eight RS-2321ports. These ports just need to be configured
for BACnet in the configuration file.
Configure the Device according to manufacturer’s instructions
FUNCTION FROM TO COLOUR
RX RJ45-01 DB9M-02 GREY
CTS RJ45-02 DB9M08 BROWN
DSR RJ45-03 DB9M-06 YELLOW
GND RJ45-04 DB9M-05 GREEN
GND RJ45-05 RED
TX RJ45-08 DB9M-03 BLUE
RTS RJ45-07 DB9M-07 ORANGE
DTR RJ45-06 DB9M-04 BLACK
8917-03 WIRE LIST
8917-03
8917-03
FieldServer
Connect to one of the RS-232 Ports on the
FieldServer
P1
18
FS-8915-10
1Not all ports shown are necessarily supported by the hardware. Consult the appropriate Instruction manual for details of the ports available
on specific hardware.

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4CONFIGURING THE FIELDSERVER AS A BACNET CLIENT
For a detailed discussion on FieldServer configuration, please refer to the FieldServer Instruction Manual. The
information that follows describes how to expand upon the factory defaults provided in the configuration files
included with the FieldServer (See “.csv” sample files provided with the FieldServer).
This section documents and describes the parameters necessary for configuring the FieldServer to communicate
with a BACnet PTP Server.
The configuration file tells the FieldServer about its interfaces, and the routing of data required. In order to enable
the FieldServer for BACnet communications, the driver independent FieldServer buffers need to be declared in the
“Data Arrays” section, the destination device addresses need to be declared in the “Client Side Nodes” section, and
the data required from the Servers needs to be mapped in the “Client Side Map Descriptors” section. Details on
how to do this can be found below.
4.1 Data Arrays/ Descriptors
Note that in the tables, * indicates an optional parameter, with the bold legal value being the default.
Section Title
Data_Arrays
Column Title
Function
Legal Values
Data_Array_Name
Provide name for Data Array
Up to 15 alphanumeric characters
Data_Array_Format
Provide data format. Each Data Array can only
take on one format.
Float, Bit, Uint16, Uint32, Sint16,
Sint32, Packed_Bit, Byte,
Packed_Byte, Swapped_Byte
Data_Array_Length
Number of Data Objects. Must be larger than the
data storage area required by the Map
Descriptors for data placed in this array.
1-10, 000
Example
// Data Arrays
Data_Arrays
Data_Array_Name
, Data_Array_Format
, Data_Array_Length
DA_AI_01
, Float
, 200
DA_AO_01
, Float
, 200
DA_DI_01
, Bit
, 200
DA_DO_01
, Bit
, 200

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4.2 Setting the FieldServer Node_ID
Section Title
FieldServer
Column Title
Function
Legal Values
System_Node_ID
Configure Node_ID of FieldServer
1-255
Example
// FieldServer
FieldServer
Title
, System_Node_ID
BACnet_PTP
, 11
4.3 Client Side Connection Descriptions
Section Title
Connections
Column Title
Function
Legal Values
Port
Port Name
P1-P82
Baud*
Specify baud rate
110; 300; 600; 1200; 2400; 4800; 9600; 19200; 38400; 57600; 115000
Parity*
Specify parity
Odd, Even, None
Data_Bits*
Specify data bits
7, 8
Stop_Bits*
Specify stop bits
1,2
Protocol
Specify Protocol Used
BACnet_PTP
Example
// Client Side Connections
Connections
Port
, Baud
, Parity
, Data_Bits
, Stop_Bits
, Protocol
P8
, 9600
, Even
, 7
, 1
, BACnet_PTP
2Not all ports shown are necessarily supported by the hardware. Consult the appropriate Instruction manual for details of the ports available
on specific hardware.

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4.4 Client Side Node Descriptors
Section Title
Nodes
Column Title
Function
Legal Values
Node_Name
Provide name for Node
Up to 32 alphanumeric characters
Node_ID
Specify the BACnet Device object instance.
1 - 16777215
Protocol
Specify protocol used
BACnet_PTP
Port
Specify port
P1-P8
Example
// Client Side Nodes
Nodes
Node_Name
, Node_ID
, Protocol
, Port
DEV_1
, 1
, BACnet_PTP
, P1

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4.5 Client Side Map Descriptors
Column Title
Function
Legal Values
Map_Descriptor_Name
Name of this Map Descriptor. This is used for
Object_Name Property. Refer to Appendix A.1.
Up to 32 alphanumeric characters
Data_Array_Name
Name of Data Array where data is to be stored
in the FieldServer
One of the Data Array names from
“Data_Array” section
Data_Array_Offset
Starting location in Data Array
0 to (“Data_Array_Length” -1)
Function
Function of Client Map Descriptor
Rdbc, Wrbc, Wrbx, Ars
4.5.1 Driver Related Map Descriptor Parameters
Column Title
Function
Legal Values
Node_Name
Name of Node to fetch data from
One of the node names
specified in “Client Node
Descriptor”
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, -
4.5.2 Timing Parameters
Column Title
Function
Legal Values
Scan_Interval*
Rate at which data is polled
0-32000, 2s

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4.5.3 Map Descriptor Example.
// Client Side Map Descriptors
Map_Descriptors
Map_Descriptor_Name
, Data_Array_Name
, Data_Array_Offset
, Function
, Node_Name
, Data_Type
, Object_Instance
, Property
, Scan_Interval
CMD_AI_01
, DA_AI_01
, 0
, Rdbc
, DEV_1
, AI
, 1
, Present_Value
, 20.000s
CMD_AI_02
, DA_AI_01
, 1
, Rdbc
, DEV_1
, AI
, 2
, Present_Value
, 20.000s
CMD_AI_03
, DA_AI_01
, 2
, Rdbc
, DEV_1
, AI
, 3
, Present_Value
, 20.000s
CMD_AO_01
, DA_AO_01
, 0
, Rdbc
, DEV_1
, AO
, 1
, Present_Value
, 30.000s
CMD_AO_02
, DA_AO_01
, 1
, Rdbc
, DEV_1
, AO
, 2
, Present_Value
, 30.000s
CMD_AO_03
, DA_AO_01
, 2
, Rdbc
, DEV_1
, AO
, 3
, Present_Value
, 30.000s
Map_Descriptors
Map_Descriptor_Name
, Data_Array_Name
, Data_Array_Offset
, Function
, Node_Name
, Data_Type
, Object_Instance
, Property
, Scan_Interval
CMD_DI_01
, DA_DI_01
, 0
, Rdbc
, DEV_1
, BI
, 1
, Present_Value
, 15.000s
CMD_DI_02
, DA_DI_01
, 1
, Rdbc
, DEV_1
, BI
, 2
, Present_Value
, 15.000s
CMD_DI_03
, DA_DI_01
, 2
, Rdbc
, DEV_1
, BI
, 3
, Present_Value
, 15.000s
CMD_DO_01
, DA_DO_01
, 0
, Rdbc
, DEV_1
, BO
, 1
, Present_Value
, 30.000s
CMD_DO_02
, DA_DO_01
, 1
, Rdbc
, DEV_1
, BO
, 2
, Present_Value
, 30.000s
CMD_DO_03
, DA_DO_01
, 2
, Rdbc
, DEV_1
, BO
, 3
, Present_Value
, 30.000s

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5CONFIGURING THE FIELDSERVER AS A BACNET SERVER
For a detailed discussion on FieldServer configuration, please refer to the FieldServer Configuration Manual. The
information that follows describes how to expand upon the factory defaults provided in the configuration files
included with the FieldServer (See “.csv” sample files provided with the FieldServer).
This section documents and describes the parameters necessary for configuring the FieldServer to communicate
with a BACnet PTP Client.
The configuration file tells the FieldServer about its interfaces, and the routing of data required. In order to enable
the FieldServer for BACnet communications, the driver independent FieldServer buffers need to be declared in the
“Data Arrays” section, the FieldServer virtual node(s) needs to be declared in the “Server Side Nodes” section, and
the data to be provided to the clients needs to be mapped in the “Server Side Map Descriptors” section. Details on
how to do this can be found below.
Note that in the tables, * indicates an optional parameter, with the bold legal value being the default.
5.1 Driver Specific FieldServer Parameters
Section Title
Bridge
Column Title
Function
Legal Values
Title
FieldServer name
Text
Network_Number*
Specify a unique network number if there are multiple virtual Server nodes.
1-65535
5
Example
// FieldServer Driver specific parameters
Bridge
Title
, Network_Number
Bacnet Server
, 6
5.2 Data Arrays/Descriptors
Note that in the tables, * indicates an optional parameter, with the bold legal value being the default.
Section Title
Data_Arrays
Column Title
Function
Legal Values
Data_Array_Name
Provide name for Data Array
Up to 15 alphanumeric characters
Data_Array_Format
Provide data format. Each Data Array can only
take on one format.
Float, Bit, Uint16, Uint32, Sint16,
Sint32, Packed_Bit, Byte,
Packed_Byte, Swapped_Byte
Data_Array_Length
Number of Data Objects. Must be larger than the
data storage area required by the Map
Descriptors for data placed in this array.
1-10, 000

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Example
// Data Arrays
Data_Arrays
Data_Array_Name
, Data_Array_Format
, Data_Array_Length
DA_AI_01
, Float
, 200
DA_AO_01
, Float
, 200
DA_DI_01
, Bit
, 200
DA_DO_01
, Bit
, 200
5.3 Server Side Connection Descriptions
Section Title
Connections
Column
Title
Function
Legal Values
Port
Specify which port the device is connected
to the FieldServer
P1-P8
Baud*
Specify baud rate
110; 300; 600; 1200; 2400; 4800; 9600; 19200;
38400; 57600; 115000
Parity*
Specify parity
None, Odd, Even
Data_Bits*
Specify data bits
7, 8
Stop_Bits*
Specify stop bits
1, 2
Protocol
Specify protocol used
BACnet_PTP
Example
// Server Side Connections
Connections
Port
, Baud
, Parity
, Data_Bits
, Stop_Bits
, Protocol
P1
, 9600
, Even
, 7
, 1
, BACnet_PTP
5.4 Server Side Node Descriptors
Section Title
Nodes
Column Title
Function
Legal Values
Node_Name3
Provide name for node
Up to 32 alphanumeric characters
Node_ID
BACnet station address of physical Server node
1 - 16777215
Protocol
Specify protocol used
BACnet_PTP
Node_Option
Enable or disable COV for this node
COV_Enable, COV_Disable
3When using the Trane Tracer Summit Workstation System, this name will appear as the object name

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Example
// Server Side Nodes
Nodes
Node_Name
, Node_ID
, Protocol
4
Virtual_DEV_11
, 11
, BACnet_PTP
5.5 Server Side Map Descriptors
5.5.1 FieldServer Specific Map Descriptor Parameters
Column Title
Function
Legal Values
Map_Descriptor_Name
Name of this Map Descriptor. This is used for
Object_Name Property. Refer to Appendix A.1.
Up to 32 alphanumeric characters
Data_Array_Name
Name of Data Array where data is to be stored
in the FieldServer
One of the Data Array names from
“Data Arrays” section
Data_Array_Offset
Starting location in Data Array
0 to (“Data_Array_Length” -1)
Function
Function of Server Map Descriptor
Passive
4 Note that Port is not declared in the Server Side Nodes

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5.5.2 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
“Server Side Node Descriptors”
Object_Type
(Alias = Data_Type)
Data type in Controller
AI, AO, AV, BI, BO, BV, MI, MO, MV, NC.
Refer to Appendix D.1.
Object_Instance
(Alias = Address)
Instance of the Object on the Device.
0, 1, 2, 3, …4194303
Units*
The object units
Refer to Appendix D.3, m2
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
Active_Text5*
Specify the Active Text property of the
Object
Any text string of length up to 40
characters, Active
Inactive_Text5*
Specify the Inactive Text property of the
Object
Any text string of length up to 40
characters, Inactive
Relinquish_Default5
Specify the value to be returned as
Present_Value on startup or when control
is relinquished. Must be specified for
outputs. Refer to Appendix D.2
Any Float value
Length*
Used to create an array of sequential
Object_Instances on an Object_Type.
1 to max point count of the FieldServer,
1
Notification_Class*
Specify the Mapdescriptor_Name of the
Notification_Class Object that manages
Intrinsic Reporting for this Map Descriptor.
Refer to Appendix A.6.
One of the configured
Mapdescriptor_Names of type NC
(Notification Class). Objects are not
available to any NC if left out.
Ack_Required*
For a Notification_Class Object, specify
whether EventNotifications require a user
Acknowledgement. Refer to Appendix A.6.
Yes, No
COV_Increment*
For a Server Map Descriptor of type AO or
AI, initialize the COV_Increment property.
Refer to Appendix A.6.
Any Float value, 0
Input_alarm_State*
For binary points the user can specify
which of the states (0 or 1) to regard as an
alarm state.
0, 1
Description*
Specify the object’s description property.
Eg Room Temp –Refer to Appendix A.6.3
Any text string of length up to 40
characters, If not configured, defaults
to Object_Name.
5See the BACnet DFS to determine if a particular object supports this property

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5.5.3 Map Descriptor Example.
// Server Side Map Descriptors
Map_Descriptors
Map_Descriptor_Name
, Data_Array_Name
, Data_Array_Offset
, Function
, Node_Name
, Object_Type
, Object_Instance
, Units
SMD_AI_01
, DA_AI_01
, 0
, Passive
, Virtual_DEV_11
, AI
, 1
, Degrees-Fahrenheit
SMD_AI_02
, DA_AI_01
, 1
, Passive
, Virtual_DEV_11
, AI
, 2
, Degrees-Fahrenheit
SMD_AI_03
, DA_AI_01
, 2
, Passive
, Virtual_DEV_11
, AI
, 3
, Degrees-Fahrenheit
SMD_AO_01
, DA_AO_01
, 0
, Passive
, Virtual_DEV_11
, AO
, 1
, percent-relative-humidity
SMD_AO_02
, DA_AO_01
, 1
, Passive
, Virtual_DEV_11
, AO
, 2
, percent-relative-humidity
SMD_AO_03
, DA_AO_01
, 2
, Passive
, Virtual_DEV_11
, AO
, 3
, percent-relative-humidity
Map_Descriptors
Map_Descriptor_Name
, Data_Array_Name
, Data_Array_Offset
, Function
, Node_Name
, Object_Type
, Object_Instance
SMD_DI_01
, DA_DI_01
, 0
, Passive
, Virtual_DEV_11
, BI
, 1
SMD_DI_02
, DA_DI_01
, 1
, Passive
, Virtual_DEV_11
, BI
, 2
SMD_DI_03
, DA_DI_01
, 2
, Passive
, Virtual_DEV_11
, BI
, 3
SMD_DO_01
, DA_DO_01
, 0
, Passive
, Virtual_DEV_11
, BO
, 1
SMD_DO_02
, DA_DO_01
, 1
, Passive
, Virtual_DEV_11
, BO
, 2
SMD_DO_03
, DA_DO_01
, 2
, Passive
, Virtual_DEV_11
, BO
, 3

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Appendix A. Useful Features
Appendix A.1. BACnet object names
When an external BACnet Client builds a list of Object Names, the BACnet Server Map Descriptor names determine
the BACnet Object Name. If the Map Descriptor length is greater than 1, the Object Name will be suffixed with the
index into the Map Descriptor. For example, if the Map Descriptor name is SMD_AI_01 and the length 3, then the
Object Names will be SMD_AI_01[0], SMD_AI_01[1] and SMD_AI_01[2].
Appendix A.2. Network number
If multiple BACnet Nodes are specified on the Server side, the FieldServer automatically defaults to virtual
operation. In effect, the FieldServer simulates a software router. BACnet identifies this FieldServer using a
combination of it’s network number and IP/MAC address. The default Network number of a FieldServer is 5. If
there is more than one FieldServer on a BACnet intranet with multiple nodes, the default network number of the
additional FieldServers will need to be changed and a unique number allocated to each.
A unique network number will need to be assigned if both of the following conditions are true:
The FieldServer has multiple BACnet Server nodes.
There is more than one FieldServer on a network which includes multiple BACnet nodes.
To override the FieldServer’s default network number 5 include the following in the configuration file:
Section Title
Bridge
Column Title
Function
Legal Values
Title
FieldServer name
Text
Network_Number*
Specify a unique network number if there are multiple virtual Server nodes.
1-65534, 5
Example
// FieldServer Driver specific parameters
Bridge
Title
, Network_Number
BACnet Server
, 6
Note: While it is theoretically possible to have up to 65535 virtual nodes, it is recommended that a maximum of 32
is configured. If an application requires the configuration of more than 32 virtual nodes please consult FST.

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Appendix A.3. Accessing Data from BACnet Properties comprising Arrays of Values
Some BACnet Object properties (e.g. Priority_Array) are arrays of values (the Priority_Array property is an array of 16 values). In order to read a specific array entry, the
Array_Index must be specified in the Map Descriptor. Array_Index is a Client Side Map Descriptor function
The following example shows a configuration that will read the Priority_Array value at Array_Index 7, belonging to Analog Output 1.
Map_Descriptors
Map_Descriptor_Name
, Data_Array_Name
, Data_Array_Offset
, Function
, Node_Name
, Data_Type
, Object_ID
, Property
, Array_Index
CMD_AI_01
, DA_AI_01
, 0
, Rdbc
, DEV_01
, AO
, 1
, Priority_Array
, 7
Details of the relevant BACnet properties and their associated arrays can be found in the BACnet Protocol Spec.
Appendix A.4. FieldServer implementation of BACnet priority Arrays
When BACnet Output objects are written to the Server side of the FieldServer, an associated write priority is given to each write value. When the FieldServer receives the
write value, it stores it to the Map Descriptor Priority Array Table at the specified priority. The Priority Array Table is then scanned and the value with the highest priority
is stored to the Data Array location specified by the Map Descriptor.
When a Write “Relinquished” command is received, the value is removed from the Priority Array Table and the next highest value from the Priority Array Table is stored
to the Data Array.
If all values have been “Relinquished” from the Priority Array Table, then the Map Descriptors “Relinquish Default” value will be stored to the Data Array.

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Appendix A.4.1. Accessing Priority Array information
The Priority Array table and its “In_Use” (or Not Relinquished) state are stored internally to every Map Descriptor, and cannot be accessed directly. The information can
be accessed indirectly by specifying the following Data Arrays which will maintain an exact copy of the Priority Array Table for the Map Descriptor.
Section Title
Map_Descriptors
Column Title
Function
Legal Values
DA_Pri_Array
Name of Data Array where the Priority Array Table will be stored. Location 0 is the Relinquish Default value and
locations 1 to 16 the different entries of the Priority Array Table.
Up to 16 alphanumeric
characters
DA_Pri_Array_Offset*
Starting location in Data Array.
1-65535 , 0
DA_Pri_In_Use
Name of Data Array that indicates if a particular Priority Value is in use. Location 0 indicates whether the Relinquish
Default has been set and locations 1 to 16 indicate whether the index is in use (1), or Relinquished (0).
Up to 16 alphanumeric
characters
DA_Pri_In_Use_Offset*
Starting location in Data Array.
1-65535, 0
// Analog Output Map_Descriptor for testing Priority Arrays
Map_Descriptors
Map_Descriptor_Name
, Data_Type
, Object_ID
, Function
, Data_Array_Name
, Data_Array_Index
, Node_Name
, Length
, Relinquish_default
, DA_Pri_Array
, DA_Pri_Array_Offset
, DA_Pri_In_Use
, DA_Pri_In_Use_Offset
CMD_AOP_1
, AO
, 1
, Passive
, DA_OUT
, 0
, N1 11
, 1
, 40.56
, DA_Pri_Array_1
, 0
, DA_Pri_in_use_1
, 0

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Appendix A.5. BACnet State Text Preload
BACnet Multistate Objects have a State_Text property. This property is defined as an array of character strings representing descriptions of all possible states
of the Present_Value. The number of descriptions matches the number of states defined in the Number_Of_States property. The Present_Value, interpreted as
an integer, serves as an index into the array.
When Multistate Objects are configured on a BACnet Server it is necessary to define the State_Text property. This section illustrates how to define the
State_Text character strings and how to associate these definitions with Multistate Server Map Descriptors.
The maximum permitted length of any State_Text string is 50 characters.
Appendix A.5.1. Method 1 –Using an Offset/User Table:
//set up a look up table
Offset_Table
Offset_Table_Name
, Table_String
, Table_Index_Value
FIRE_ALRM_TEXT
, SYSTEM READY
, 1
FIRE_ALRM_TEXT
, ALARM
, 2
FIRE_ALRM_TEXT
, MAINTENANCE
, 3
FIRE_ALRM_TEXT
, OFF-LINE
, 4
FIRE_ALRM_TEXT
, IN SERVICE
, 5
FIRE_ALRM_TEXT
, OTHER
, 6
Data_Arrays
Data_Array_Name
, Data_Format
, Data_Array_Length
DA_MI_01
, UINT16
, 100
Map_Descriptors
Map_Descriptor_Name
, Data_Array_Name
, Data_Array_Offset
, Function
, Node_Name
, Data_Type
, Object_ID
, Length
, State_Text_Array
CMD_MI_01
, DA_MI_01
, 0
, Passive
, N1 11
, MI
, 1
, 1
, Fire_Alrm_Text
Must be a positive
integer.