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4.1.2 Communication Ports
The following 3 individual interfaces are mounted as the communication ports:
• RS232C port
• Serial communication port (RS485 port, optional Fibre optic or Ethernet LAN etc.)
• IRIG-B port
(1) RS232C port
This connector is a standard 9-way D-type connector for serial port RS232C transmission and
mounted on the front panel. By connecting with a personal computer using this connector, setting
operation and display functions can be performed on the personal computer.
(2) Serial communication port
Two serial communication ports can be provided. In one port, it is connected to the RSM (Relay
Setting and Monitoring system) via the protocol converter G1PR2 or IEC60870-5-103
communication via BCU/RTU (Bay Control Unit / Remote Terminal Unit) to connect between
relays and to construct a network communication system. (See Figure 4.4.1 in Section 4.4.)
In another port, it is connected to the substation automation system via Ethernet communication
networks using IEC 61850 protocol.
Screw terminal for RS485, ST connector for fibre optic, or 100Base-TX (RJ-45 connector) or
100Base-FX (SC connector) for Ethernet LAN is provided on the back of the relay as shown in
Figure 4.1.1.
(3) IRIG-B port
The IRIG-B port is mounted on the transformer module. This port collects serial IRIG-B format
data from the external clock to synchronize the relay calendar clock. The IRIG-B port is isolated
from the external circuit by using a photocoupler. A BNC connector is used as the input connector.
This port is provided on the back of the relay and Figure 4.1.1 shows the location of this connector.
Figure 4.1.1 Locations of Communication Port
20-pin terminal block
36-pin terminal block
IRIG BNC
connector
RS485
connection
terminal
100Base-FX
(
SC
,
o
p
tion
)
Opt. I/F for IEC103
(ST, option)
100Base-TX
(RJ45, option)