Siemens Solkor 7PG2113 Technical Manual page 150

The RS485 electrical connection can be used in a single or multi-drop configuration. The RS485 master must
support and use the Auto Device Enable (ADE) feature. The last device in the connection must be terminated
correctly in accordance with the master device driving the connection. The relays are fitted with an internal
terminating resistor which can be connected between A and B by fitting an external wire loop between terminals
18 and 20 on the power supply module.
The maximum number of relays that can be connected to the bus is 64.
The following settings must be configured via the relay fascia when using the RS485 interface. The shaded
settings are only visible when DNP3.0 is selected.
Setting name
Station Address
COM1-RS485 Protocol
COM1-RS485 Baud
Rate
COM1-RS485 Parity
Unsolicited Mode
Destination Address
Figure 1.1-2 Communication to Multiple Devices from Control System using RS485
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Range
0 ... 254 (IEC60870-5-103)
0 ... 247 (MODBUS)
0 ... 65534 (DNP3)
OFF, IEC60870-5-103,
MODBUS-RTU, DNP3.0
75 110 150 300 600 1200
2400 4800 9600 19200
38400
NONE, ODD, EVEN
DISABLED ENABLED
0 ... 65534
7PG2113/4/5/6 Data Communications
Default Setting
0 1...
IEC60870-5-
As Required
103
19200 As Required
EVEN As Required
DISABLED As Required
0 As Required
Notes
An address must be
given to identify the relay.
Each relay must have a
unique address.
Sets the protocol used to
communicate on the
RS485 connection.
The baud rate set on all of
the relays connected to
the same RS485 bus
must be the same as the
one set on the master
device.
The parity set on all of the
relays connected to the
same RS485 bus must be
the same and in
accordance with the
master device.
Setting is only visible
when COM1 Protocol is
set to DNP3
Setting is only visible
when COM1 Protocol is
set to DNP3
Chapter 4 Page 5 of 38