FieldServer FS-8700-73 Release note

Driver Version:
2.01
Document Revision:
3
A Sierra Monitor Company
APPLICABILITY & EFFECTIVITY
Effective for all systems manufactured after February 2012
Driver Manual
(Supplement to the FieldServer Instruction Manual)
FS-8700-73 BACnet MSTP - Serial

FS-8700-73 BACnet MSTP 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: supp[email protected]
TABLE OF CONTENTS
1BACnet MSTP Description......................................................................................................................................4
1.1 BTL Mark –BACnet Testing Laboratory .........................................................................................................4
2Driver Scope of Supply...........................................................................................................................................5
2.1 Supplied by FieldServer Technologies for this driver.....................................................................................5
2.2 Provided by the Supplier of 3rd Party Equipment ..........................................................................................5
2.2.1 Hardware ...............................................................................................................................................5
2.2.2 Optional Items .......................................................................................................................................5
3Hardware Connections ..........................................................................................................................................6
3.1 Hardware connection Tips/Hints ...................................................................................................................7
3.2 Connection Notes ..........................................................................................................................................7
4Data Array Parameters ..........................................................................................................................................8
5Configuring the FieldServer as a BACnet MSTP Client...........................................................................................9
5.1 Specify the MAC_Address of the FieldServer ................................................................................................9
5.2 Client Side Connection Parameters .............................................................................................................10
5.3 Client Side Node Parameters .......................................................................................................................11
5.4 Client Side Map Descriptor Parameters.......................................................................................................11
5.4.1 FieldServer Specific Map Descriptor Parameters .................................................................................11
5.4.2 Driver Specific Map Descriptor Parameters .........................................................................................12
5.4.3 Timing Parameters...............................................................................................................................12
5.4.4 Map Descriptor Example......................................................................................................................13
6Configuring the FieldServer as a BACnet MSTP Server........................................................................................14
6.1 Driver Specific FieldServer Parameters........................................................................................................14
6.2 Server Side Connection Parameters ............................................................................................................15
6.3 Server Side Node Parameters ......................................................................................................................16
6.4 Server Side Map Descriptor Parameters......................................................................................................16
6.4.1 FieldServer Specific Map Descriptor Parameters .................................................................................16
6.4.2 Driver Specific Map Descriptor Parameters .........................................................................................16
6.4.3 Map Descriptor Example......................................................................................................................18
Appendix A. Useful Features .......................................................................................................................................19
Appendix A.1. BACnet object names .......................................................................................................................19
Appendix A.2. Network number ..............................................................................................................................19
Appendix A.3. Accessing Data from BACnet Properties comprising Arrays of Values.............................................20
Appendix A.4. FieldServer implementation of BACnet priority Arrays....................................................................20
Appendix A.4.1. Accessing Priority Array information......................................................................................21
Appendix A.5. Relinquishing Control of a Point as a Client .....................................................................................22
Appendix A.6. BACnet State Text Preload ...............................................................................................................22
Appendix A.6.1. Method 1 –Using an Offset/User Table:................................................................................23
Appendix A.6.2. Method 2 –Using a Single Data Array:..................................................................................23
Appendix A.6.3. Using Intrinsic Reporting for a Multistate Value....................................................................24
Appendix A.7. COV and Intrinsic Reporting .............................................................................................................24
Appendix A.7.1. Notes on COV configuration:..................................................................................................24
Appendix A.7.2. Notes on Intrinsic Reporting configuration: ...........................................................................25
Appendix A.7.3. Map Descriptor Example - COV..............................................................................................26

FS-8700-73 BACnet MSTP Manual Table of Contents
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.FieldServer.com
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Appendix A.7.4. Map Descriptor Example - Enable or Disable COV .................................................................26
Appendix A.7.5. Map Descriptor Example –Intrinsic Reporting.......................................................................26
Appendix A.7.6. Setting the Priority of Intrinsic Alarming................................................................................26
Appendix A.7.7. Map Descriptor Example –Set up a Permanent Static Recipient List ....................................27
Appendix A.8. Factors Determining the Reliability Property...................................................................................28
Appendix A.9. Specifying ReadPropertyMultiple and WritePropertyMultiple Transactions using Linked Map
Descriptors...............................................................................................................................................................28
Appendix A.10. Update Property Function..............................................................................................................31
Appendix A.10.1. Supported values:.................................................................................................................31
Appendix A.10.2. Mode of Operation when used for the Relinquish_Default property: ..................................31
Appendix A.11. Disabling selected BACnet services ................................................................................................31
Appendix A.12. Using a .ini file to set the Vendor_ID and Vendor_Name of the Device Object.............................33
Appendix B. Troubleshooting ......................................................................................................................................34
Appendix B.1. Debugging a BACnet connection ......................................................................................................34
Appendix B.2. COV Configuration............................................................................................................................34
Appendix B.3. BACnet Specific Statistics .................................................................................................................34
Appendix B.4. BACnet Specific Error Messages .......................................................................................................35
Appendix B.5. BACnet Error Response Decoding ....................................................................................................35
Appendix B.5.1. BACnet Error CLASS ................................................................................................................35
Appendix B.5.2. BACnet Error CODES for Error Class OBJECT...........................................................................36
Appendix B.6. Rediscovering Offline Devices ..........................................................................................................37
Appendix B.7. Timeout Errors..................................................................................................................................37
Appendix B.8. PDU limit reached errors ..................................................................................................................37
Appendix C. Vendor Information.................................................................................................................................38
Appendix C.1. McQuay ............................................................................................................................................38
Appendix C.2. Trane.................................................................................................................................................38
Appendix C.3. Liebert ..............................................................................................................................................38
Appendix C.4. Automated Logic Corporation. .........................................................................................................38
Appendix C.5. Honeywell EBI...................................................................................................................................38
Appendix C.6. Using Cimetrics Explorer...................................................................................................................38
Appendix D. Reference ................................................................................................................................................41
Appendix D.1. Object_Type Legal Values –Abbreviation Descriptions...................................................................41
Appendix D.2. Property Legal Values.......................................................................................................................41
Appendix D.3. Units .................................................................................................................................................43

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1BACNET MSTP DESCRIPTION
The BACnet Master-Slave/Token-Passing (MSTP) driver implements a data link protocol that uses the services of
the RS-485 physical layer. See the FieldServer BACnet PIC statement for the level of conformance that this driver
implements.
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.
BTL Mark –BACnet Testing Laboratory
The BTL mark is a symbol that indicates to a consumer that a product has passed a
series of rigorous tests conducted by an independent laboratory which verifies that the
product correctly implements the BACnet features claimed in the listing. The mark is a
symbol of a high-quality BACnet product. For more information about the BACnet
Testing Laboratory go to: http://www.bacnetinternational.net/btl/.
Max Nodes Supported
FieldServer Mode
Nodes
Comments
Client
1
Server
32

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2DRIVER SCOPE OF SUPPLY
Supplied by FieldServer Technologies for this driver
FieldServer Technologies PART #
Description
FS-8917-16
RJ45 to terminal connector cable
Provided by the Supplier of 3 rd Party Equipment
Hardware
Part #
Description
BACnet Controller(s) on RS-485 Network
Optional Items
PART #
Vendor/Manufacturer
Description
FS-4301-00
FieldServer
RS-232 to RS-485 converter

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3HARDWARE CONNECTIONS
The FieldServer is connected to the BACnet MSTP as shown in connection drawing.
Configure the BACnet MSTP according to manufacturer’s instructions
DATE: 5/26/06
BY: MC
(408)-262-2299
BASE NAME:
FILE NAME: 8700-73 .VSD
FIELDSERVER
BACNET MSTP
CONNECTION DIAGRAM
FieldServer
+-Gnd
Server 1
+-Gnd
Server 1
+-Gnd
Server n
+-Gnd
Client
+-Gnd
FieldServer
+-Gnd
Server 2
+-Gnd
Server n
+-Gnd
FieldServer as a BACnet MSTP Client
FieldServer as a BACnet MSTP Server

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Hardware connection Tips/Hints
Follow standard RS-485 2-wire guidelines for installation. See connection diagram below.
R1 -
+
FieldServer
GND 100
1/2 W
TD(A)
TD(B)
RD(A)
RD(B)
GND
485SDD16
TD(A)
TD(B)
RD(A)
RD(B)
GND
485SDD16
100
1/2 W
100
1/2 W
RS-485 2-wire Connection
Connection Notes
The x25 and the QuickServer do not support being configured as a BACnet MSTP client on one port and a BACnet
MSTP server on another port at the same time. The x40 and the x30 support this.
In order for this to work the BACnet MSTP server section must be configured first.

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4DATA ARRAY PARAMETERS
Data Arrays are “protocol neutral” data buffers for storage of data to be passed between protocols. It is necessary
to declare the data format of each of the Data Arrays to facilitate correct storage of the relevant data.
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, 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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5CONFIGURING THE FIELDSERVER AS A BACNET MSTP CLIENT
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 MSTP Server.
The configuration file tells the FieldServer about its interfaces, and the routing of data required. In order to enable
the FieldServer for BACnet MSTP 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.
Note that in the tables, * indicates an optional parameter, with the bold legal value being the default.
Specify the MAC_Address of the FieldServer
The MAC_Address is used on the Data_Link (or physical) layer as the source or destination address. See section
9.1.1.2 of the BACnet ANSI/ASHREA standard for more information.
Section Title
FieldServer
Column Title
Function
Legal Values
System_Node_ID
Specify the MAC_Address of the FieldServer.
1-254
Example
// Bridge
Bridge
Title
, System_Node_ID
BACnet_MSTP
, 11

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Client Side Connection Parameters
Section Title
Connections
Column Title
Function
Legal Values
Port
Specify which port the device is connected to the FieldServer
P1-P81, R1-R22
Baud
Specify baud rate
9600, 19200, 38400,
768003
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_MSTP
Poll Delay*
Time between internal polls
0-32000s, 1s
Timeout
Application logger timeout
30s
Max_Master*
Specify the highest MAC_Address for Master nodes. When
designing a MSTP network with multiple Master_Node devices,
allocate the MAC_Address settings on the different devices starting
at 1. This will allow you to specify a small Max_Master parameter
and hence will improve overall network performance
1-127
Max_Info_Frames
Specify the maximum number of information frames the connection
may send before it must pass the token.
1-65535
Example
// Client Side Connections
Connections
Port
, Baud
, Parity
, Data_Bits
, Stop_Bits
, Protocol
, Poll_Delay
, Timeout
R1
, 38400
, None
, 8
, 1
, BACnet_MSTP
, 0.100s
, 30s
1
P1 to P8 will require the optional RS-485 converter (Part # 4301-00)
2
Not all ports shown are necessarily supported by the hardware. Consult the appropriate Instruction manual for details of the ports available
on specific hardware.
3
76800 baud is supported on the X30, X25 and ProtoCessor but not on the X20 and X40

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Client Side Node Parameters
Section Title
Nodes
Column Title
Function
Legal Values
Node_Name
Provide name for Node
Up to 31 alphanumeric
characters
Node_ID
Specify the BACnet Device object instance.
1 - 16777215
Protocol
Specify protocol used
BACnet_MSTP
Port
Specify port
P1-P84, R1-R25
MAC_Address
MAC_Address of the physical server node.
1-127 (for Master Nodes)
1-254 (for Slave Nodes)
Network_Number*
Use this parameter if the remote MSTP server device is on
another BACnet network connected via a router.
1, 2, 3.... 16 bit positive
numbers, 5
Retries*
Number of timeouts before the Node goes offline.
0,1,2,3
Either Node_ID OR MAC_Adddress must be specified. If the Server Node supports Who-Is and I-Am then it is
better to use the Node_ID parameter.
Example
// Client Side Nodes
Nodes
Node_Name
, Node_ID
, Protocol
, Port
, Retries
DEV_1
, 1
, BACnet_MSTP
, R1
, 2
Client Side Map Descriptor Parameters
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. Ensure that unique names
are configured for each device. Refer to Appendix
A.1.
Up to 37 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 Section 4
Data_Array_Offset
Starting location in Data Array
0 to (“Data_Array_Length” -1)
as specified in Section 4
Function
Function of Client Map Descriptor
Rdbc, Wrbc, Wrbx, Arcs
4
P1 to P8 will require the optional RS-485 converter (Part # 4301-00)
5
Not 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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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

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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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6CONFIGURING THE FIELDSERVER AS A BACNET MSTP 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 MSTP Client.
The configuration file tells the FieldServer about its interfaces, and the routing of data required. In order to enable
the FieldServer for BACnet MSTP 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.
Driver Specific FieldServer Parameters
Section Title
Bridge
Column Title
Function
Legal Values
Title
FieldServer name
Text
System_Station_Address
The FieldServers MAC address on the MSTP network
1-254
Example
// FieldServer Driver specific parameters
Bridge
Title
, System_Station_Address
BacNet MSTP Server V1.02a
, 11

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Server Side Connection Parameters
Section Title
Connections
Column Title
Function
Legal Values
Port
Specify which port the device is connected to the FieldServer
P1-P86, R1-R27
Baud*
Specify baud rate
9600, 19200, 38400,
768008
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_MSTP
Connection_Type*
Specify if the connection must be in Master_Mode or in
Slave_Mode
MSTP_Master_Mode
MSTP_Slave_Mode
Max_Master*
Specify the highest possible MAC_Address that exists on the
MSTP network. Only applicable for MSTP_Master Mode
connections. (See also section 4.7)9
1-127
Max_Info_Frames*
Specify the maximum number of information frames the
connection may send before it must pass the token. Only
applicable for MSTP_Master Mode connections. 9
1-65535
Example
// Server Side Connections
Connections
Port
, Baud
, Parity
, Data_Bits
, Stop_Bits
, Protocol
, Timeout
, Connection_Type
R1
, 38400
, None
, 8
, 1
, BACnet_MSTP
, 30
, MSTP_Master_Mode
6
P1 to P8 will require the optional RS-485 converter (Part # 4301-00)
7
Not all ports shown are necessarily supported by the hardware. Consult the appropriate Instruction manual for details of the ports available
on specific hardware.
8
76800 baud is supported on the X30, X25 and ProtoCessor but not on the X20 and X40
9
For Server configurations the Max_Master and Max_Info_Frames parameters (or properties) can be overridden from a BACnet Client by using
the “Write Property” command. Note that when the FieldServer is restarted, the default values specified in the configuration file will be
applied
If the Server connection needs to operate in Slave Mode then specify the
Connection_Type as MSTP_Slave_Mode

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Server Side Node Parameters
10
Section Title
Nodes
Column Title
Function
Legal Values
Node_Name
Provide name for Node
Up to 31 alphanumeric
characters
Node_ID
BACnet station address of physical Server node
1 - 16777215
Protocol
Specify protocol used
BACnet_MSTP
Node_Option*
Enable or disable COV for this Node. Refer to Appendix A.7 for
further information.
COV_Enable, COV_Disable, -
Model_Name*
Sets the Model Name Property of the Device Object
Up to 32 alphanumeric
characters
Example
// Server Side Nodes
Nodes
Node_Name
, Node_ID
, Protocol
, Model_Name
11
Virtual_DEV_11
, 11
, BACnet_MSTP
, WBA11M. MSTP
Server Side Map Descriptor Parameters
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 37 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
Section 4
Data_Array_Offset
Starting location in Data Array
0 to (“Data_Array_Length” -1) as
specified in Section 4
Function
Function of Server Map Descriptor
Passive
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)
Data type in Controller
AI, AO, AV, BI, BO, BV, MI, MO, MV, NC.
Refer to Appendix A.1.
10
Only one Server Node may be defined for each connection. For information on support for multiple virtual server nodes on a single
connection please contact the Sales Department."
11
Note that Port is not declared in the Server Side Nodes

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Column Title
Function
Legal Values
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_Text12*
Specify the Active Text property of the
Object
Any text string of length up to 40
characters, Active
Inactive_Text12*
Specify the Inactive Text property of the
Object
Any text string of length up to 40
characters, Inactive
Relinquish_Default12
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.7.
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.7.
Yes, No
COV_Increment*
For a Server Map Descriptor of type AO or
AI, initialize the COV_Increment property.
Refer to Appendix A.7.
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.
E.g. Room Temp –Refer to Appendix A.7.3
Any text string of length up to 40
characters, If not configured, defaults
to Object_Name.
Process_ID*
The handle of a process within the
recipient device that is to receive the event
notification. Refer to Appendix A.7.6.
Any Unsigned integer, -
Notification_Class_MD*
This is the Notification Class map
descriptor governing the sending of Event
Notifications (Intrinsic Alarming) Refer to
Appendix A.7.6
Map Descriptor defined per Appendix
A.7
12
See the BACnet DFS to determine if a particular object supports this property

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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].
It is important that unique Map Descriptor names are created for each device to ensure that the Object Names are
unique.
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.
Note 2: If an application demands multiple BACnet IP Server nodes and multiple BACnet MSTP Server Nodes
simultaneously, they will at present all appear with the same virtual network number. This creates a potential
conformance problem if there is an external BACnet router connecting the BACnet IP and BACnet MSTP networks
to which the FS is also connected, as duplicate virtual networks with the same network number would then exist in
the BACnet network, which is not permitted. Please contact FST for assistance.

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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.
If no Array_Index is specified, then the entire property (i.e. the entire BACnet Array) is returned.
The Data_Index parameter functions as follows for ReadPropertyMultiple or WritePropertyMultiple requests when the Client Map Descriptor length N is greater than 1:
When an Array_Index is specified, the ReadPropertyMultiple or WritePropertyMultiple request will iterate through N successive Array_Index values for the given
Object and Property (e.g. Priority Array Index 1 to 16 of Analog Output 1)
When no Array_Index is specified, the ReadPropertyMultiple or WritePropertyMultiple request will iterate through N successive Object Instances, reading the
specified Property from each successive object (e.g. Present Value of Analog Output 1 to Analog Output 16)
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.