-
A Sierra Monitor Company
Driver Manual
(Supplement to the FieldServer Instruction Manual)
FS-8700-73 BACnet MSTP - Serial
APPLICABILITY & EFFECTIVITY
Effective for all systems manufactured after August 2008
Driver Version:
1.00
Document Revision: 25
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FS-8700-73 BACnet MSTP Driver Manual
Page 3 of 24
1.
BACnet 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.
Max Nodes Supported
FieldServer Mode Nodes Comments
Client
1
Server
32
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FS-8700-73 BACnet MSTP Driver Manual
Page 4 of 24
2.
Driver Scope of Supply
2.1. Supplied by FieldServer Technologies for this driver
FieldServer Technologies
PART #
Description
FS-8917-16
RJ45 to terminal connector cable.
2.2.
Provided by the Supplier of 3rd Party Equipment
2.2.1.
Required 3rd Party Hardware
Part #
Description
Building control unit (BCU)1
BACnet client such as a Trane Tracer Summit workstation2
2.2.2.
Optional Items
PART #
FS-4301-00
Vendor/Manufacturer
FieldServer
Description
RS-232 to RS-485 converter
1 If FieldServer used as BACnet Client.
2 If FieldServer used as BACnet Server
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FS-8700-73 BACnet MSTP Driver Manual
Page 5 of 24
3.
Hardware Connections
The FieldServer is connected to the BACnet MSTP as shown in connection drawing.
Configure the BACnet MSTP according to manufacturer’s instructions
FieldServer as a BACnet MSTP Client
FieldServer
+
-
Gnd
Gnd
+
-
+
-
Gnd
+
-
Gnd
Server n
Server 1
Server 1
FieldServer as a BACnet MSTP Server
Client
+
-
Gnd
-
Gnd
+
+
-
Gnd
+
-
Gnd
Server n
FieldServer
Server 2
(408)-262-2299
FIELDSERVER
BACNET MSTP
CONNECTION DIAGRAM
BASE NAME:
FILE NAME: 8700-73 .VSD
DATE: 5/26/06
BY: MC
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Page 6 of 24
3.1.
Hardware connection Tips/Hints
Follow standard RS-485 2-wire guidelines for installation. See connection diagram below.
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Page 7 of 24
4.
Configuring 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.
4.1.
Data Arrays/Descriptors
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.
Section Title
Data_Arrays
Column Title
Function
Legal Values
Up to 15 alphanumeric
characters
Data_Array_Name
Provide name for Data Array
Float, Bit, Uint16, Uint32,
Sint16, Sint32, Packed_Bit,
Byte, Packed_Byte,
Swapped_Byte
Data_Format
Provides data format
Data_Array_Length
Number of Data Objects
1-10,000
Example
// Data Arrays
Data_Arrays
Data_Array_Name,
DA_AI_01,
DA_AO_01,
DA_DI_01,
Data_Array_Format,
Data_Array_Length
Float,
Float,
Bit,
200
200
200
200
DA_DO_01,
Bit,
4.2.
Setting the FieldServer Node_ID
Section Title
FieldServer
Column Title
Function
Legal Values
Specify the MAC_Address of the
FieldServer. (See Appendix C.1)
System_Node_ID
1-254
Example
// FieldServer
FieldServer
Title,
BACnet_MSTP,
System_Node_ID
11
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Page 8 of 24
4.3.
Client Side Connection Descriptions
Section Title
Connections
Column Title
Function
Specify which port the device is connected to the
FieldServer
Legal Values
P1-P83, R1-R24
Port
9600,
38400,
Baud
Specify baud rate
768005
Parity*
Specify parity
Specify data bits
Specify stop bits
Specify protocol used
Time between internal polls
Application logger timeout
Odd, Even, None
7, 8
1,2
BACnet_MSTP
0-32000s, 1s
30s
Data_Bits*
Stop_Bits*
Protocol
Poll Delay*
Timeout
Specify the highest possible MAC_Address that exists on
the MSTP network. (See Appendix C.1)
Specify the maximum number of information frames the
connection may send before it must pass the token.
Max_Master**
1-127
Max_Info_Frames
1-65535
Example
// Client Side Connections
Connections
Port, Baud,
R1, 38400, None, 8,
Parity, Data_Bits, Stop_Bits, Protocol,
Poll_Delay Timeout
30s
1, BACnet_MSTP, 0.100s
3 P1 to P8 will require the optional RS-485 converter (Part # 4301-00)
4
Not all ports shown are necessarily supported by the hardware. Consult the appropriate Instruction
manual for details of the ports available on specific hardware.
5 76800 baud is supported on the X30, X25 and ProtoCessor
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Page 9 of 24
4.4.
Client Side Node Descriptors
Section Title
Nodes
Column Title
Function
Provide name for node
Specify the BACnet Device object instance. 6
Specify protocol used
Legal Values
Up to 32 alphanumeric
characters
Node_Name
Node_ID
Protocol
Port
1 - 4194303
BACnet_MSTP
Specify port
P1-P87, R1-R28
1-127
Nodes)
1-254
(for
(for
Master
Slave
MAC_Address
MAC_Address of the physical server node.6
Nodes)
1,2,3.... 16 bit positive
numbers.
5
Use this parameter if the remote MSTP server device
is on another BACnet network connected via a router.
Network_Number*
Example
// Client Side Nodes
Nodes
Node_Name,
BCU_1,
Node_ID,
1,
Protocol,
BACnet_MSTP,
Port
R1
6
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.
7 P1 to P8 will require the optional RS-485 converter (Part # 4301-00)
8
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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Page 10 of 24
4.5.
4.5.1.
Client Side Map Descriptors
FieldServer Related Map Descriptor Parameters
Column Title
Function
of this
Descriptor
Legal Values
to 32 alphanumeric
Name
Map Up
characters
Map_Descriptor_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_Name
0 to Data_Array_Length-1 as
Starting location in Data
Array
Data_Array_Offset
Function
specified
section
in
“Data_Array”
Function of Client Map
Descriptor
Rdbc, Wrbc, Wrbx
4.5.2.
Driver Related Map Descriptor Parameters
Column Title
Function
Legal Values
One of the node names
specified in “Client Node
Descriptor” above
Name of Node to fetch data
from
Node_Name
AI, AO, AV, BI, BV, MI, MO,
Data_Type
Data type in FieldServer
MV9
Object_Instance
Property*
Address of object
The BACnet property to be
read
0, 1, 2, 3, …
Present_Value
Data_Array_Low_Scale*
Data_Array_High_Scale*
Scaling zero in Data Array
Scaling max in Data Array
-32767 to 32767, 0
-32767 to 32767, 100
Scaling zero in Connected
Node
Scaling max in Connected
Node
Node_Low_Scale*
Node_High_Scale*
-32767 to 32767, 0
-32767 to 32767, 100
Allows the driver to specify
the write priority used to write
Write_Priority
Custom_Type
Custom_Prop
1..16, 16
1..1023
an output.
See also
Appendix B.2
This
over-writes the
Data_Type with a numerical
value for the Data_Type. e.g.
Analog Value = 2
This over-writes the Property
with a numerical value for the
property. e.g. Present Value
= 85
1..4194303
4.5.3.
Timing Parameters
Column Title
Scan_Interval*
Function
Rate at which data is polled
Legal Values
0-32000, 2s
9 Refer to Appendix A.1 for further information.
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Page 12 of 24
5.
Configuring 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.
5.1.
Driver Specific FieldServer Parameters
Section Title
Bridge
Column Title
Function
FieldServer name
Legal Values
Title
Text
Specify a unique network number
if there are multiple virtual Server
nodes.
1-255
5
Network_Number*
Example
// FieldServer Driver specific parameters
Bridge
Title,
Network_Number
Bacnet Server,
6
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Page 13 of 24
5.2.
Server Side Connection Descriptors
Section Title
Connections
Column Title
Function
Specify which port the device is connected to the
FieldServer
Specify baud rate
Specify parity
Specify data bits
Specify stop bits
Specify protocol used
Legal Values
P1-P810, R1-R211
9600, 38400, 7680012
None, Odd, Even
7, 8
Port
Baud
Parity*
Data_Bits*
Stop_Bits*
Protocol
1, 2
BACnet_MSTP
Specify if the connection must be in Master_Mode or MSTP_Master_Mode
Connection_Type
in Slave_Mode
MSTP_Slave_Mode
Specify the highest possible MAC_Address that exists
on the MSTP network.
Only applicable for
Max_Master*
1-127
MSTP_Master Mode connections. (See also section
4.7)13
Specify the maximum number of information frames
the connection may send before it must pass the
token. Only applicable for MSTP_Master Mode
connections. 13
Max_Info_Frames*
1-65535
Example
// Server Side Connections
Connections
Port,
R1,
Baud,
38400,
Parity,
None,
Data_Bits,
8,
Stop_Bits,
1,
Protocol,
BACnet_MSTP,
5.3.
Server Side Node Descriptors14
Section Title
Nodes
Column Title
Function
Legal Values
Up
to
32
alphanumeric
Node_Name
Provide name for node
characters15
1 - 4194303
BACnet_MSTP
Node_ID
Protocol
Node ID
Specify protocol used
10 P1 to P8 will require the optional RS-485 converter (Part # 4301-00)
11
Not all ports shown are necessarily supported by the hardware. Consult the appropriate Instruction
manual for details of the ports available on specific hardware.
12 76800 baud is supported on the X30, X25 and ProtoCessor
13
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 as specified in the configuration file will be applied
14
Only one Server Nodes may be defined for each connection. For information on support for multiple
virtual server nodes on a single connection please contact the Sales Department."
15 For HMI systems, this name will appear as the object name
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Page 14 of 24
Example
// Server Side Nodes
Nodes
Node_Name,
Virtual_BCU_11,
16
Node_ID,
11,
Protocol
BACnet_MSTP
16 Note that adapter is not declared in the Server Side Nodes
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Page 15 of 24
5.4.
5.4.1.
Server Side Map Descriptors
FieldServer Specific Map Descriptor Parameters
Column Title
Function
Legal Values
Map_Descriptor_Name Name of this Map Descriptor
Name of Data Array where
Up to 32 alphanumeric characters.
One of the Data Array names from
“Data Array” section
Data_Array_Name
data is to be stored in the
FieldServer
0
to Data_Array_Length-1 as
Data_Array_Offset
Function
Starting location in Data Array
specified in “Data_Array” section
Function of
Descriptor
Server
Map
Server
5.4.2.
Driver Specific Map Descriptor Parameters
Column Title
Function
Legal Values
One of the node names
specified in “Server Node
Descriptor” above
Node_Name
Name of FieldServer Node
AI, AO, AV, BI, BV, MI, MO,
Data_Type
Data type in BCU
MV17
Object_Instance
Units
Address of the object
The object units
0, 1, 2, 3, …
Appendix 1
Data_Array_Low_Scale*
Data_Array_High_Scale*
Scaling zero in Data Array
Scaling max in Data Array
-32767 to 32767, 0
-32767 to 32767, 100
Scaling zero in Connected
Node
Scaling max in Connected
Node
Specify the Active Text
property of the Object 18
Specify the Inactive Text
Node_Low_Scale*
Node_High_Scale*
Active_Text
-32767 to 32767, 0
-32767 to 32767, 100
Any legal BACnet ASCII string
Inactive_Text
property of the Object (See Any legal BACnet ASCII string
note12)
Specify
the
startup
Relinquish_Default
Property
Relinquish_Default
Any legal BACnet ASCII string
1..1023
value for this Object (See
note12)
This
over-writes
the
Data_Type with a numerical
value for the Data_Type. e.g.
Analog Value = 2
This over-writes the Property
with a numerical value for the
property. e.g. Present Value =
85
Custom_Type
Custom_Prop
1..4194303
17 Refer to Appendix A.1 for further information.
18 See the BACnet DFS to determine if a particular object supports this property
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Appendix A. Driver Notes
Page 17 of 24
Appendix A.1.
Data_Type Legal Values – Abbreviation Descriptions
AI
Analog_Input
AO Analog_Output
AV Analog_Value
BI
BV Binary_Value
MI
Multi_State_Input
Binary_Input
MO Multi_State_Output
MV Multi_State_Value
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Appendix B. Advanced Topics
Page 18 of 24
Appendix B.1.
BACnet Object Names
When an external BACnet Client builds a list of Object Names, the BACnet Server Map Descriptor
name determines the BACnet Object Name. If the Map Descriptor length is greater than 1, then 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 B.2.
BACnet Priority Arrays
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.
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. If the following data arrays are specified, however, they
will maintain an exact copy of the Priority Array Table for the Map Descriptor. Thus the Priority Array
Table can be accessed.
Section Title
Map_Descriptors
Column Title
Function
Legal Values
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
DA_Pri_Array
alphanumeric
characters
DA_Pri_Array_Offset
DA_Pri_In_Use
Starting location in Data Array.
Name of Data Array that indicates if a particular
1-65535 (17)
Priority Values is in use. Location 0 indicate if the Up
to
16
Relinquish Default has been set and locations 1 to 16 alphanumeric
indicate if the index is in use (1), or if it has been characters
Relinquished (0).
DA_Pri_In_Use_Offset Starting location in Data Array.
1-65535 (17)
Appendix B.3.
Limitations of the BACnet Read_Property_Multiple service.
The BACnet PTP client driver can read multiple BACnet objects using the Read_Property_Multiple
service under the following conditions:
•
•
•
•
The number of objects to be read must not exceed 29.
No gaps must exist in the range of object to be read.
The Map Descriptor function must be of the Read type. (e.g. Rdbc)
The Map Descriptor property must be Present Value.
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Appendix C. Troubleshooting Tips
Page 20 of 24
Appendix C.1.
Debugging a BACnet connection: Hints and tips
•
•
Disconnect the FieldServer from the BACnet network when transferring images to the BCU.
If duplicate object instances are accidentally configured in the FieldServer, the second call of the
instance will overwrite the first one. This may cause a BACnet Object to be “lost.”
If “Virtual_BCU_…” is not being indicated as the device description for the FieldServer on the
BACnet SCADA system, then the FieldServer is not communicating with the SCADA system. If
the present value’s name is being indicated, but the present value shows question marks, then it
is most likely that the Client side of the FieldServer is not communicating.
•
•
•
•
When new points are added to the FieldServer it is important to restart the Summit Workstation or
BCU, otherwise these new points may not be seen by the FieldServer.
Polling BACnet addresses that are not configured for Lieberts systems may cause the connection
to fail in older versions of Lieberts. Please contact your Lieberts supplier for more information.
When a BACnet_MSTP connection is configured as a server, it is better to use a connection_type
MSTP_Slave_Node. The only time when a server connection must be a Master_Node is when
alarming has been established on the FieldServer.
•
•
Extra memory is required to store Map Descriptors that have the active/inactive text parameters
specified. If the defaults are appropriate, do not specify these parameters. This will save memory
and allow more Map Descriptors to be created.
The FieldServer MAC_Address is configured using the System_Node_ID field (See section 4.2)
This MAC_Address is used on the data_link (or physical) layer as the source or destination
addresses. See section 9.1.1.2 of the BACnet ANSI/ASHREA standard for more information.
The MAC_Address is not to be confused with the Node_ID setting (Section 4.4) that specifies the
BACnet device object instance.
•
•
When designing the 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.
When a FieldServer/ProtoCessor is configured to support MSTP virtual server nodes the firmware
achieves this by implementing a virtual router and thus a network number is required so that it
can expose its nodes to external devices as belonging to a specific network. (The default is
network 5 if not specified). This network number is defined on the bridge descriptor as
Network_Number. It must be unique for a site. Refer also to Section 5.1, Section 4.4 and
Appendix A.1.
•
McQuay Units are shipped with a default Device instance of the last 6 digits of the McQuay
Serial number.
•
•
Trane Specific Tips
When new points are added to the FieldServer it is important to restart Summit Workstation or
BCU, otherwise these new points may not be seen by the FieldServer.
•
Disconnect the FieldServer from the BACnet network when transferring images to the BCU
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Page 21 of 24
Appendix C.2.
Stat
BACnet Specific Statistics
Description
Resolution
It is normal to receive a few link control
messages. If the number is higher than the
transmit/receive messages, however, there
A “who-is” link control message
was sent or received.
Link Control
may
be
a
problem
with
lost
communications..
This is not an error. BACnet clients often
poll all properties of a particular object to
determine which properties are supported.
Unsupported
Properties
A
request for an unsupported
property was received.
Data was requested but the
response would have exceeded the This is not an error - the BACnet client will
maximum size of the APDU and use a different method to read data from
could not be sent using an un- the FieldServer.
Segmentation
Not Supported
segmented message.
Invoke ID of a reply did not match You should not see this message. It
Sequence Error
the Invoke ID of the poll.
normally indicates a configuration error.
This typically happens when trying to write
to an Input Object that is not Out-Of-
Service. It is not possible to write to Input
Objects.
Write
Access
A write to an object was denied.
Denied
This may be a problem on the Client
system. Consult the PIC statement to
determine what services are supported.
Exception
Errors
A BACnet Service was denied
because it is not supported
Appendix A.1.
Network Number
If there are multiple FieldServers or third party devices on a BACnet Network each with multiple
Server nodes a unique network number must be assigned to each device. This will ensure
communication between the BACnet Client and all Servers.
For MSTP devices the network number is provided by the router.
A consequence of this is that when you configure a MSTP client you must know not only the Node_ID
of the server node but you need to know the network number. These are specified on the node
descriptor for client applications as Node_ID and Network_Number. If the network number is not
specified then the node is assumed to exist on the local segment.
Another consequence of this is that the network number is not relevant for server configurations.
The network number is a 16 bit positive number. To override the FieldServer’s default network
number 5, refer to Section 5.1
Appendix C.3.
Corporation.
Known problems with third party devices - Automated Logic
When an ALC module is powered up, and it does not detect valid BACnet/MSTP traffic on its MSTP
port, then the module goes into a terminal mode and MSTP communications will never happen.
When connecting the FieldServer to an ALC BACnet/MSTP module, always start the FieldServer first.
Wait until the RUN Led is flashing on the FieldServer before powering up the MSTP module.
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Appendix D. Units
Page 22 of 24
Variation 3
Unit
Variation 1
Variation 2
Amperes
Amps
A
Bars
BTUs
BTUs-per-hour
btus-per-pound
btus-per-pound-dry-air
centimeters
centimeters-of-mercury
centimeters-of-water
cubic-feet
cubic-feet-per-minute
cubic-feet-per-seconds
cubic-meters
cubic-meters-per-hour
cubic-meters-per-seconds
Currency1
Currency2
Currency3
Currency4
Currency5
Currency6
Currency7
Currency8
Currency9
Currency10
cycles-per-hour
cycles-per-minute
days
degrees-angular
Degrees-Celsius
degrees-celsius-per-hour
degrees-celsius-per-minute
Degrees-days-Celsius
Degrees-days-Fahrenheit
Degrees-Fahrenheit
degrees-fahrenheit-per-hour
degrees-fahrenheit-per-minute
Degrees-Kelvin
degrees-phase
delta-degrees-fahrenheit
delta-degrees-kelvin
feet
Deg-C
Deg_C
Deg-F
Deg-K
Deg_F
Deg_K
feet-per-minute
feet-per-second
foot-candles
grams-water-per-kg-dry-air
hectopascals
Hertz
Hz
Horsepower
HP
hours
imperial-gallons
imperial-gallons-per-min
inches
inches-of-mercury
inches-of-water
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Page 23 of 24
Variation 3
Unit
Variation 1
Variation 2
Joules
joules-per-degree-kelvin
joules-per-kilogram-degree-kelvin
joules-per-kilogram-dry-air
Kilograms
Kg
kilograms-per-hour
kilograms-per-minute
kilograms-per-second
Kilohertz
KHz
kilohms
Kilojoules
kilojoules-per-kilogram
kilometers-per-hour
Kilopascals
kilovolt-amperes
kilovolt-amperes-reactive
kilovolts
kilovolt-amps
KVAR
KVA
kilowatt-hour-per-square-foot
kilowatt-hour-per-square-meter
kilowatt-hours
kilowatts
KWh
KWh
liters
liters-per-hour
liters-per-minute
liters-per-second
lumens
luxes
Megahertz
MHz
megajoules
megajoules-per-square-foot
megajoules-per-square-meter
megavolt-amperes
Megavolt-amperes-reactive
megavolts
megavolt-amps
MVAR
megawatts
MW
megohms
meters
meters-per-second
miles-per-hour
milliamperes
milliamps
millibars
millimeters
millimeters-of-mercury
Millivolts
Milliwatts
minutes
months
No-Units
No Units
No_Units
None
ohms
parts-per-billion
parts-per-million
Pascals
Percent
percent-obscuration-per-foot
percent-obscuration-per-meter
percent-per-second
percent-relative-humidity
Per-hour
% RH
Percent RH
Percent RH
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FS-8700-73 BACnet MSTP Driver Manual
Page 24 of 24
Variation 3
Unit
Variation 1
Variation 2
per-minute
per-second
pounds-force-per-square-inch
Pounds-mass
PSI
pounds-force-per-sq-inch
pounds-mass-per-hour
pounds-mass-per-minute
pounds-mass-per-second
Power-Factor
PF
psi-per-degrees-fahrenheit
radians
revolutions-per-minute
seconds
Secs
S
square-centimeters
square-feet
square-inches
square-meters
Therms
ton-hours
Tons
Tons-refrigeration
US-gallons
us-gallons-per-minute
Volt-Amperes
volt-amperes-reactive
Volts
watt-hours
Gallons
GPM
Volt-Amps
VAR
Voltage
Wh
VA
Watts
W
watts-per-square-foot
watts-per-square-meter
watts-per-square-meter-degrees-kelvin
weeks
years
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