Section 2 DNP3 overview
2.1 DNP3 standard
The DNP3 protocol was developed by Westronic based on the early versions of the
IEC 60870-5 standard telecontrol protocol specifications. Now the protocol
specification is controlled by the DNP Users Group at
www.dnp.org.
The ISO/OSI based model supported by this protocol specifies physical, data link and
application layers only. This reduced protocol stack is referred to as EPA. However,
to support advanced RTU functions and messages larger than the maximum frame
length as defined by the IEC document 60870-5-1, the DNP3 data link is intended to
be used with a transport pseudo-layer. As a minimum, this transport layer implements
message assembly and disassembly services.
2.2 Documentation
This implementation of DNP3 is fully compliant with DNP3 Subset Definition Level
2, and contains significant functionality beyond Subset Level 2.
1MRS758757 A Section 2
DNP3 overview
REC615 and RER615 7
Communication Protocol Manual
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