7SR224 Argus Data Comms
©2010 Siemens Protection Devices Limited Chapter 4 Page 9 of 76
J Loss per connector
dB
K Total loss at connectors (IxJ)
dB
L Total losses (E+H+K)
dB
M Receive power budget (A-L)
dB
N Safety Margin
dB
O Device Receive Sensitivity
dB
There are two optional fibre optic ports, com3 and com4, and when fitted the associated settings are available in
the Data Communication menu. To allow communication using either or both of these ports the relay settings
must be changed, via the fascia, in accordance with the method of connection and master device.
Setting name Range Default Setting Notes
Station Address
1 – 254 for IEC60870-5-
103 or IEC60870-5-101
0 – 247 for Modbus RTU
0 – 65520 for DNP3.0
1
0
0
As Required
An address within the range
of the relevant protocol must
be given to identify the relay.
Each relay must have a
unique address.
COM3 Protocol
OFF, IEC60870-5-103,
MODBUS-RTU, DNP3.0
or IEC60870-5-101
IEC60870-5-
103
As Required
Sets the protocol used to
communicate on the fibre
optic connection – Com3
COM3 Baud Rate
75 110 150 300 600 1200
2400 4800 9600 19200
38400 57600
57600 As Required
The baud rate set on all of
the relays connected to the
same system must be the
same as the one set on the
master device.
COM3 Parity
NONE, ODD, EVEN EVEN As Required
The parity set on all of the
relays connected to the
same fibre optic system
must be the same and in
accordance with the master
device.
COM3 Line Idle
LIGHT ON, LIGHT OFF LIGHT OFF As Required
Sets the idle state of the line
in accordance with master
device
COM3 Data Echo
ON,OFF OFF As Required
Set to ON when relays are
connected in a ring
configuration.
COM3 Mode
Local, Remote, Local Or
Remote
Remote Remote
Selects port mode
COM4 Protocol
OFF, IEC60870-5-103,
MODBUS-RTU, DNP3.0
or IEC60870-5-101
IEC60870-5-
103
As Required
Sets the protocol used to
communicate on the fibre
optic connection – Com4.
COM4 Baud Rate
75 110 150 300 600 1200
2400 4800 9600 19200
38400
57600 As Required
The baud rate set on all of
the relays connected to the
same system must be the
same as the one set on the
master device.
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