17
The relay can be connected to an Ethernet-based
communications network via a copper RJ45
(100Base TX) or fiber optic LC (100Base FX) con-
nector or serial network via the RS-485 option that
provides one 4-wire or two 2-wire ports. When the
protection and control relay uses the RS-485 bus
for the serial communication, both two- and four
wire connections are supported. Termination and
pull-up/down resistors can be configured with
jumpers on the communication card so external re-
sistors are not needed.
Modbus implementation supports RTU, ASCII and
TCP modes. Besides standard Modbus functional-
ity, the relay supports retrieval of time-stamped
events, changing the active setting group and up-
loading of the latest fault records. If a Modbus TCP
connection is used, five clients can be connected to
the relay simultaneously. Further, Modbus serial
and Modbus TCP can be used in parallel, and if re-
quired both IEC 61850 and Modbus protocols can
be run simultaneously.
Modbus over TCP/IP is supported with the Ethernet
communications option selected. Besides standard
Modbus functionality such as status and control
operations, the relay supports retrieval of time-
stamped events, uploading of disturbance files and
storing of the latest fault records. For the Modbus
TCP connection, a maximum of five clients can be
connected to the relay simultaneously.
DNP3.0 Level 2+ over TCP/IP is also supported with
the Ethernet communications card option. Another
serial communications option offers programma-
ble RS-232 or RS-485 and fiber-optic (ST) serial
ports. Communication channel redundancy is sup-
ported for DNP3. RER620 listens the DNP master on
both channels - serial and TCP/IP - simultaneously
and responds on both ports. One DNP master is
supported. Status and control, including recloser/
breaker trip/close control, operations are sup-
ported in the Level 2+ implementation. Optional se-
rial (RS-232/RS-485) communication interfaces are
available that support user programmable proto-
cols of DNP3.0 Level 2+, IEC 60870-5-101, PG&E 2179
, and Modbus RTU/ ASCII. Another serial communi-
cations option offers programmable RS-232 or RS-
485 and fiber-optic (ST) serial ports. All serial com-
munication card options include an Ethernet
communications port and an IRIG-B port for dedi-
cated time synchronization network connections.
The companion standards IEC 60870-5-101 (for se-
rial line) and IEC 60870-5-104 (for Ethernet) are de-
rived from the IEC 60870-5 protocol standard defi-
nition. It specifies a functional profile for basic
telecontrol tasks. The protection and control relay
supports both balanced and unbalanced link mode.
The relay supports the time synchronization with a
time-stamping resolution of +/-1 ms:
Ethernet based:
• SNTP (primary and secondary server support)
With special time synchronization wiring:
• IRIG-B (Inter-Range Instrumentation Group - Time
Code Format B)
• In addition, the protection and control relay sup-
ports time synchronization via the following se-
rial communication protocols:
• Modbus
• DNP3
• IEC 60870-5-103
—
Interfaces/protocols
Ethernet Serial
Fiber-optic (ST)
• • - -
Modbus over TCP/IP • • - -
• • - -
SNTP • • - -
FTP • • - -
• • - -
- - • •
Modbus RTU/ASCII - - • •
IRIG-B time synchronization - - • •
- - • •
- - • •
• = supported
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