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FS-8700-47 DNP 3.0 Driver Manual Page 14 of 51
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4.4.7. Map Descriptor Example 4 – Reading Class Data
In this example we read class data. A class is a structure of different data types and variations. Vendors group data into classes based on the
relationships and importance of the data. In this example you will see that only one of the Map Descriptors is active – the class data read. The
remaining passive Map Descriptors are used to process the response from the class data read. The response may consist of a number of data
object types and variations and is dependent on the vendor’s implementation of DNP. Some vendors allow users to configure what objects
constitute a class.
// Class 1 Data
Map_Descriptors
Map_Descriptor_Name ,Scan_Interval ,Data_Array_Name ,Data_Array_Offset ,Function ,Node_Name ,Address ,Length ,dnpSubType ,dnpDataType ,dnpDataVari ,dnpQualifier ,dnpAssociate ,timeout
Class1-Data ,13.0s ,DA_A3 ,0 ,Rdbc ,Node_A ,0 ,100 ,value ,60 ,1 ,6 ,1 ,5.0s
Map_Descriptors
Map_Descriptor_Name ,Scan_Interval ,Data_Array_Name ,Data_Array_Offset ,Function ,Node_Name ,Address ,Length ,dnpSubType ,dnpDataType ,dnpDataVari ,dnpAssociate
Class1-di ,3.0s ,CL_1 ,0 ,Passive ,Node_A ,0 ,156 ,value ,1 ,0 ,1
Class1-do ,3.0s ,CL_2 ,0 ,Passive ,Node_A ,0 ,9 ,value ,10 ,0 ,1
Class1-co ,3.0s ,CL_3 ,0 ,Passive , Node_A ,0 ,39 ,value ,20 ,0 ,1
Class1-ai-1 ,3.0s ,CL_4 ,0 ,Passive ,Node_A ,0 ,100 ,value ,30 ,0 ,1
Class1-ai-2 ,3.0s ,CL_5 ,0 ,Passive ,Node_A ,100 ,100 ,value ,30 ,0 ,1
Class1-ai-3 ,3.0s ,CL_6 ,0 ,Passive ,Node_A ,200 ,100 ,value ,30 ,0 ,1
4.4.8. Map Descriptor Example 5 – Read an unknown quantity of points (Qualifier 6)
In this example the qualifier has been set to 6. This is the qualifier the protocol uses to request all possible points of a particular object type and
variation. Ensure that there is sufficient length to store all possible data.
// Client Side Map Descriptors
Map-Descriptors
Map_Descriptor_Name ,Data_Array_Name ,Data_Array_Offset ,Function ,Node_Name ,Address ,Length ,Scan_Interval ,dnpDataType ,dnpDataVari ,DnpQualifier
ReadAll_AI’s ,DA_AI ,0 ,Rdbc ,Node_A ,0 ,100 ,5.0s ,30 ,
1
,6
The common value for dnpAssociate ties these Map
Descriptors together and tells the driver to use them both to
process the response data.
This Map Descriptor requests class 1 data from the DNP device.
Enough space has been reserved for 100 objects. If the response contains more then
there will be an error.
The Qualifier of 6 tells the driver
to request all data objects.
These Map Descriptors process the data that the device returns. If more
data is returned that you have defined Map Descriptors for then it will be
abandoned.