Chapter 4 - 7SR242 Duobias · Data Communications Definitions
© 2015 Siemens Protection Devices Limited
Chapter 4 - Page 15 of 92
Setting Name
Range/Options
Default
Setting
Notes
COM3
Protocol
OFF
IEC60870-5-103
MODBUS-RTU
DNP3
IEC60870-5-103
The protocol used
to communicate on
the standard RS485
connection.
COM3
Station
Address
0 - 254 for IEC60870-5-103
1 - 247 for Modbus RTU
0 - 65534 for DNP3.0
0
An address within the
range of the relevant
protocol must be
given to identify the
relay. Each relay in a
network must have a
unique address.
COM3
Baud Rate
75 110 150 300
600 1200 2400 4800
9600 19200 38400
57600 115200
19200
The baud rate set
on all of the relays
connected to the
control system must
be the same as the
one set on the master
device.
COM3
Parity
NONE
ODD
EVEN
EVEN
The parity set on
all of the relays
connected to the
control system must
be the same and in
accordance with the
master device.
COM3
Line Idle
LIGHT ON
LIGHT OFF
LIGHT OFF
LIGHT OFF
Not applicable for
RS 485 or RS 232
option, set to OFF.
COM3
Data Echo
#1
ON
OFF
OFF
OFF
Not applicable for
RS 485 or RS 232
option, set to OFF.
COM3
Mode
Local
Local or Remote
Remote
Remote
, for
further explanation
USB or 9 pin male
D connector
RS232 cross-over cable or RS232 to USB converter cable
Laptop computer
COMMS MODULE
IRIG-B
COM3
7SR24
Fig. 2-6 Additional (Optional) Rear RS232 + IRIG-B Connection to a PC
Pin
Relay Function
1
Not Connected
2
Receive Data (RXD)
3
Transmit Data (TXD)
Summary of Contents for 7SR242 Duobias
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