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DNP3 (Data Link Layer ([1] Control ([7] DIR, [6] PRM, [5:4]FCB,FCV/0,DFC,…
DNP3
Data Link Layer
2 Bytes: Start 0x05, 0x64
1 Byte: Length
[1] Control
[7] DIR
[6] PRM
[5:4]FCB,FCV/0,DFC
[3:0]Fun code
[2] Destination LSB + MSB
[2] Source LSB + MSB
[2] CRC LSB+MSB
Application Layer
4 Bytes: Header
1 Byte: Control
1 Byte: Function code
2 Bytes: IIN LSB + MSB
5 Bytes: First Object Header
1 Byte: Group
1 Byte: Variation
1 Byte: Qualifier
[6:4] Object Type
0=No index
1/2/3= index
4/5/6/=size
7=reserved
[3:0] Range Specifier Code (Q-code)
#
2 Bytes: Ranger Field