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BACnet PTP Serial Driver Manual 

Page 20 of 34 

Appendix A.6. COV and Intrinsic Reporting 

The COV (Change of Value) and Intrinsic Reporting services are two distinct ways in which point values 
can  be  reported  to  a  client  workstation  as  they  change,  i.e.  in  an  event-driven  opposed  to  a  polling 
method. This can increase performance dramatically  compared to  polling  method alone. It also reduces 
network traffic significantly. 

The services are suited to different purposes: 

 

COV is suited to value updates. On analog points the sensitivity can be set using the COV_Increment 
property. Only changes larger than the COV_Increment value will be reported. 

 

Intrinsic  Reporting  is  used  for  alarming.  It  is  implemented  via  Notification_Class  objects,  which  can 
receive subscriptions from client  workstations that add themselves to the RecipientList property of a 
Notification_Class 

object. 

Notifications 

are 

done 

using 

ConfirmedEventNotification 

or 

UnconfirmedEventNotification.  Intrinsic  Reporting  also  allows  for  alarms  to  be  acknowledged  (using 
the  AcknowledgeAlarm  service)  and  for  all  subscribed  client  workstations  to  be  notified  of  alarm 
acknowledgements (using EventNotifications of type ACK_NOTIFICATION). 

Appendix A.6.1. Notes on COV Configuration 

 

No special configuration entries are needed to enable COVs. The service is enabled by default for all 
protocols  except  MSTP.  Most  client  workstations  will  automatically  subscribe  to  all  points  once  they 
discover that the FieldServer supports COV services. This only applies to BACnet Objects - Property 
subscribes are  not supported by  the FieldServer. COV only  works for BACnet  Map  Descriptors  with 
length set to 1. If length is not specified, then it defaults to 1, so this is only a problem where length 
has been specified as greater than 1. 

 

The Node_Option parameter can be configured to enable or disable COV. An example configuration 
is presented i

Appendix A.7.3

. 

 

For  analog  Server  Map  Descriptors,  the  user  may  optionally  configure  a  COV_Increment  value  to 
adjust the reporting threshold. If it is not set the COV_Increment defaults to zero. 

 

Change of Value (COV) Notifications are generated for all data objects for which a remote client has 
issued  a  SubscribeCOV-Request.  COV  subscription  is  on  a  per-point  basis.  The  SubscribeCOV-
Request regulates  whether Notifications are  Confirmed or Unconfirmed. The remote client may  also 
write the COV_Increment property in order to control the deadband for changes in analog values. The 
COV_Increment  property  can  be  initialized  via  the  configuration  file  by  setting  the  COV_Increment 
Map  Descriptor  Property.  The  value  set  by  the  configuration  is  an  initial  value  that  is  loaded  on 
startup. It would be replaced by any new value written by the Client. 

Appendix A.6.2. Notes on Intrinsic Reporting Configuration: 

 

Intrinsic  Reporting  is  managed  by  Notification  Class  objects.  At  least  one  Notification  Class  object 
must be configured for Intrinsic Reporting to work. 

 

Each Data_Object that is to be monitored by Intrinsic Reporting must be linked to a Notification Class 
object via the Notification_Class Map Descriptor Property. For analog points alarm limits must be set 
up, and for binary points, the Input_Alarm_State must be set up. 

 

The  Notification_Class  object  contains  properties  that  allow  a  client  workstation  to  modify  rules 
governing event reporting, such as Event_Type, days of week, start and end times etc. 

 

The RecipientLists are non-volatile, and subscriptions must be renewed on system restart. 

Summary of Contents for FieldServer FS-8700-16 BACnet PTP

Page 1: ...on 2 01 Document Revision 1 B FieldServer FS 8700 16 BACnet PTP Serial Driver Manual Supplement to the FieldServer Instruction Manual APPLICABILITY EFFECTIVITY Effective for all systems manufactured a...

Page 2: ...support needs related to the FieldServer product Sierra Monitor Corporation 1991 Tarob Court Milpitas CA 95035 Website www sierramonitor com U S Support Information 1 408 964 4443 1 800 727 4377 Email...

Page 3: ...6 Appendix A 1 BACnet Object Names 16 Appendix A 2 Network Number 16 Appendix A 3 Accessing Data from BACnet Properties Comprising Arrays of Values 17 Appendix A 4 FieldServer Implementation of BACnet...

Page 4: ...7 Appendix C 3 Liebert 27 Appendix C 4 Automated Logic Corporation 27 Appendix C 5 Honeywell EBI 27 Appendix D Reference 28 Appendix D 1 Object_Type Legal Values Abbreviation Descriptions 28 Appendix...

Page 5: ...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 nu...

Page 6: ...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 B...

Page 7: ...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 Byte Uint16 Uint3...

Page 8: ...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 In the following tables indicates an optional parameter and b...

Page 9: ...xample Client Side Nodes Nodes Node_Name Node_ID Protocol Port Retries DEV_1 1 BACnet_PTP P1 2 5 4 Map Descriptor Parameters Column Title Function Legal Values Map_Descriptor_Name Name of this Map Des...

Page 10: ...turn 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 BAC...

Page 11: ...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_N...

Page 12: ...ptors section Details on how to do this can be found below NOTE In the tables below indicates an optional parameter with the bold legal value as default 6 1 Driver Specific FieldServer Parameters Sect...

Page 13: ...D Protocol 4 Virtual_DEV_11 11 BACnet_PTP 6 4 Server Side Map Descriptor Parameters 6 4 1 FieldServer Specific Map Descriptor Parameters Column Title Function Legal Values Map_Descriptor_Name Name of...

Page 14: ...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_Inst...

Page 15: ..._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 perc...

Page 16: ...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 un...

Page 17: ...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 sto...

Page 18: ...ble 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 FIR...

Page 19: ...ues in its row 0 normal 1 alarm 2 fault set up a look up table Offset_Table Offset_Table_Name Table_String Table_Index_Value Table_User_Value FIRE_ALRM_TEXT SYSTEM READY 1 0 FIRE_ALRM_TEXT ALARM 2 1 F...

Page 20: ...set to 1 If length is not specified then it defaults to 1 so this is only a problem where length has been specified as greater than 1 The Node_Option parameter can be configured to enable or disable...

Page 21: ...jects Map_Descriptors Map_Descriptor_Name Data_Array_Name Data_Array_Offset Function Node_Name Object_Type Object_Instance Ack_Required SMC_NC_01 DA_NC_01 0 Passive Virtual_DEV_11 NC 1 Yes SMC_NC_02 D...

Page 22: ...re are three options for translating these conditions to BACnet Reliability values Track_Object_Status The Reliability property mirrors the internal data object state i e if the Remote Server Node is...

Page 23: ...val o Timeout o Length Any number of Linked Map Descriptors specifying additional objects and data array locations to be included in the transaction Each Linked Map Descriptor is specified with the fo...

Page 24: ...3 Device Max_Master Passive_Client DA RPM 0 N1 1 CMD RPM 4 Device Max_Info_Frames Passive_Client DA RPM 1 N1 1 CMD RPM 2 AO Passive_Client DA RPM 2 N1 1 CMD RPM 1 AO Passive_Client DA RPM 6 N1 1 Addr...

Page 25: ...d 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...

Page 26: ...n error 15 Missing required parameter 16 No objects of specified type 17 No space for object 18 No space to add list element 19 No space to write property 20 No vt sessions available 21 Property is no...

Page 27: ...olling BACnet addresses that are not configured for Liebert systems may cause the connection to fail in older versions of Liebert Please contact your Liebert supplier for more information Appendix C 4...

Page 28: ...l about the Object Out_of_service The Out_Of_Service property of type BOOLEAN is an indication whether TRUE or not FALSE the physical input that the object represents is not in service This means that...

Page 29: ...nd shall be less than or equal to 127 If the Max_Master property is not writeable via BACnet services its value shall be 127 Max_Info_Frames Relevant to BACnet MS TP Device Object Type The Max_Info_Fr...

Page 30: ...cubic meters per hour Volumetric Flow cubic meters per minute Volumetric Flow cubic meters per second Volumetric Flow currency1 Currency currency10 Currency currency2 Currency currency3 Currency curr...

Page 31: ...Enthalpy kilobecquerels Other kilo btus Energy kilo btus per hour Power kilograms kg Mass kilograms per cubic meter Other kilograms per hour Mass Flow kilograms per kilogram Other kilograms per minute...

Page 32: ...Other milligrams per gram Other milligrams per kilogram Other milligrams per liter Other milligray Other milliliters Volume milliliters per second Volumetric Flow millimeters Length millimeters of me...

Page 33: ...Area square meters Area square meters per Newton Other standard cubic feet per day Volumetric Flow teslas Electrical therms Energy thousand cubic feet per day Volumetric Flow thousand standard cubic f...

Page 34: ...pported Data was requested but the response would have exceeded the maximum size of the APDU and could not be sent using an un segmented message This is not an error the BACnet client will use a diffe...

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