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The DNP3 protocol has significant features that make it more robust, efficient, and interoperable than older protocols such as Modbus, at the cost of higher complexity. In terms of the OSI model for networks, DNP3 specifies a layer 2 protocol.
Modbus TCP nomenclature is the same as for the Modbus over Serial line protocol, as any device which send out a Modbus command, is the 'client' and the response comes from a 'server'. [29] The ADU for Modbus TCP is officially called Modbus TCP/IP ADU by the Modbus organization [30] and is also called Modbus TCP frame by other parties. [3]
Second, DNP has a much tighter object library than Modbus. Modbus systems often pack data in to various registers. This is unnecessary with DNP. Furthermore, Modbus is not well defined for issues such as Endian-ness. There is no standard way of sending the time in Modbus. There are no floating point number representations in Modbus.
IEC 61850 is an international standard defining communication protocols for intelligent electronic devices at electrical substations.It is a part of the International Electrotechnical Commission's (IEC) Technical Committee 57 reference architecture for electric power systems. [1]
IEC 60870 part 6 in electrical engineering and power system automation, is one of the IEC 60870 set of standards which define systems used for telecontrol (supervisory control and data acquisition) in electrical engineering and power system automation applications.
IEC 60870-5-101 [IEC101] is a standard for power system monitoring, control & associated communications for telecontrol, teleprotection, and associated telecommunications for electric power systems.
Modbus RTU or ASCII or TCP; oBIX - Open Building Information Exchange is a standard for RESTful Web Services-based interfaces to building control systems developed by OASIS. UPB - 2-way Peer to Peer Protocol; VSCP - Very Simple Control Protocol is a free protocol with main focus on building- or home-automation; xAP – Open protocol
IEC 60870 part 5, known as Transmission protocols, [1] provides a communication profile for sending basic telecontrol messages between two systems, which uses permanent directly connected data circuits between the systems.
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