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FS-8700-47 DNP 3.0 Driver Manual Page 20 of 51
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5.3.6. Map Descriptor Example 3 – Class Data (another example)
In this example the Server responds with a number of non-consecutive binary points. All will work fine except when the Client polls for this data
with qualifier 7. The default response will be qualifier 7 with implied index style 0. The problem is that qualifier 7 tells the Client the number of
objects in the packet, but they are all assumed to be addressed sequentially from address 0. When the data is served, the Client will unpack each
portion, thinking that the address is zero for each portion and hence the data will be overwritten. To prevent this add the dnpIndexStyle parameter
with a value of 1 to force the Server to prefix each point of data with the address of the point and thus allow the Client to unpack the data correctly.
All this can be avoided by having the Client poll for data with a qualifier of 1.
// Server Side Map Descriptors
Map_Descriptors
Map_Descriptor_Name ,Data_Array_Name ,Data_Array_Location ,Function
,Node_Name ,Address ,Length ,DNPDataType ,DNPDataVari ,DNPAssociate
Class_0_Data ,DA_DUMMY ,0 ,Server ,RTU ,0 ,1 ,60 ,0
Map_Descriptors
Map_Descriptor_Name ,Data_Array_Name ,Data_Array_Location ,Function
,Node_Name ,Address ,Length ,DNPDataType ,DNPDataVari ,DNPAssociate ,dnpIndexStyle
Class_0_Analogs ,DA_AI_01 ,0 ,Server ,RTU ,1 ,16 ,32 ,1 ,1 ,1
Class_0_Discs_1 ,DA_DI_01 ,0 ,Server ,RTU ,1 ,3 ,2 ,1 ,1 ,1
Class_0_Discs_2 ,DA_PB_01 ,5 ,Server ,RTU ,4 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_3 ,DA_PB_01 ,7 ,Server ,RTU ,5 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_4 ,DA_PB_01 ,9 ,Server ,RTU ,6 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_5 ,DA_PB_01 ,11 ,Passive ,RTU ,7 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_6 ,DA_PB_01 ,13 ,Passive ,RTU ,8 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_7 ,DA_PB_01 ,15 ,Passive ,RTU ,9 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_8 ,DA_PB_01 ,17 ,Passive ,RTU ,10 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_9 ,DA_PB_01 ,27 ,Passive ,RTU ,11 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_10 ,DA_PB_01 ,29 ,Passive ,RTU ,12 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_11 ,DA_PB_01 ,41 ,Passive ,RTU ,13 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_12 ,DA_PB_01 ,43 ,Passive ,RTU ,14 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_13 ,DA_PB_01 ,45 ,Passive ,RTU ,15 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_14 ,DA_PB_01 ,48 ,Passive ,RTU ,16 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_15 ,DA_PB_01 ,49 ,Passive ,RTU ,17 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_16 ,DA_PB_01 ,51 ,Passive ,RTU ,18 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_17 ,DA_PB_01 ,53 ,Passive ,RTU ,19 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_18 ,DA_PB_01 ,55 ,Passive ,RTU ,20 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_19 ,DA_PB_01 ,61 ,Passive ,RTU ,23 ,1 ,2 ,1 ,1 ,1
Class_0_Discs_20 ,DA_PB_01 ,63 ,Passive ,RTU ,24 ,1 ,2 ,1 ,1 ,1