ABB RELION REF615R, Technical Manual

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communication interface option. A shielded twisted-pair cable CAT 5e is used with
RJ-45, and an optical cable (≤ 2 km) with LC type connections.
In addition, communication modules with multiple Ethernet connectors enable the
forwarding of Ethernet traffic. The variants include an internal switch that handles the
Ethernet traffic between a protection relay and a station bus. In this case, the used network
can be a ring or daisy-chain type of network topology. In loop type topology, a self-healing
Ethernet loop is closed by a managed switch supporting rapid spanning tree protocol. In
daisy-chain type of topology, the network is bus type and it is either without switches,
where the station bus starts from the station client, or with a switch to connect some
devices and the REF615R protection relay chain to the same network.
Communication modules including Ethernet connectors X1, X2, and X3 can utilize the
third port for connecting any other device (for example, an SNTP server, that is visible for
the whole local subnet) to a station bus.
The protection relay's default IP address through this port is 192.168.2.10 with the TCP/IP
protocol. The data transfer rate is 100 Mbps.
14.3.3 EIA-232 serial rear connection
The EIA-232 connection follows the TIA/EIA-232 standard and is intended to be used
with a point-to-point connection. The connection supports hardware flow control (RTS,
CTS, DTR, DSR), full-duplex and half-duplex communication.
14.3.4 EIA-485 serial rear connection
The EIA-485 communication module follows the TIA/EIA-485 standard and is intended
to be used in a daisy-chain bus wiring scheme with 2-wire half-duplex or 4-wire full-
duplex, multi-point communication.
The maximum number of devices (nodes) connected to the bus where the
protection relay is used is 32, and the maximum length of the bus is 1312
yards (1200 meters).
14.3.5 Optical ST serial rear connection
Serial communication can be used optionally through an optical connection either in loop
or star topology. The connection idle state is light on or light off.
1MRS240050-IB C
Section 14
Protection relay's physical connections
REF615R 627
Technical Manual