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© 2020 KOSTAL Solar Electric GmbH
Operation and operating the device
Modbus RTU
KOSTAL solar inverters, but also other devices, can be
connected to the Modbus RTU RS485 interface.
In the “ Modbus RTU slave” mode, the KOSTAL Smart
Energy Meter provides the measurement data via the
RS485 interface. In the “ Modbus RTU Master” mode on
the other hand, measurement data is sent and written to
other slave devices in order to control them. The Modus
master is only available with user-defined settings.
Both RS485 interfaces A and B can be configured
individually.
When an inverter is selected for RS485 interface A or B,
all fields are populated with predefined values. These can
be adapted if necessary.
RS485
Modbus
LAN
L1
L2
L3
L1
L2
L3
N
LAN
STATUS
NETWORK
SERIAL BUS
REST
Smart Energy Meter
A
B
A > PIKO IQ / PLENTICORE plus
B > PIKO MP plus
VCC
GND
Data A
Data B
4
3
2
1
Fig. 8: RS485 interfaces
INFO
You will find details of how to connect
the communication cable from the
inverter to the RS485 socket in the
KOSTAL Smart Energy Meter's instal-
lation instructions.
Depending on the cable length and
number of participants on the bus,
we would recommend terminating
the bus at both ends with a 120 Ohm
resistor. Termination reduces reflec-
tions in the connection. Under certain
circumstances, this may be absolute-
ly essential for application reliability.
2
3
4
5
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