Figure 9.2.3 Ethernet communication structure
9.2.3 IEC60870-5-103 Communication
The IEC specification IEC60870-5-103: Telecontrol Equipment and Systems, Part 5: Transmission
Protocols Section 103 defines the use of standards IEC60870-5-1 to IEC60870-5-5 to perform
communication with protective device. The standard configuration for the IEC60870-5-103
protocol is to use a twisted pair EIA RS-485 connection over distances up to 500m. It also supports
to use an Ethernet connection. The relay operates as a slave in the system, responding to
commands from a master station.
To use the rear port with IEC60870-5-103 communication, the relevant settings to the protective
device must be configured.
9.2.4 DNP3.0 Communication
The DNP3.0 (Distributed Network Protocol) protocol can support the OSI/EPA model of the ISO
(International Organization for Standards), and it includes four parts: application layer protocol,
transport functions, data link layer protocol and data object library. The DNP3.0 protocol is
recommended to use the Ethernet network. This relay operates as a slave in the system,
responding to commands from a master station.
9.3 IEC60870-5-103 Interface over Serial Port
The IEC60870-5-103 interface over serial port (RS-485) is a master/slave interface with the
protective device as the slave device. It is properly developed by SUNRI.
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