38
Establishing a
Connection via
Modbus RTU
1. Connect the bus cabling (B) to the Ohmpilot. (The bus cabling is carried out in parallel
via the TX+, TX- and GND cables with the Fronius Smart Meter and the Fronius
inverter or Datamanager 2.0).
2. Terminate the RS485 bus with a resistance at the rst and last device. The resistance
can be activated on the Ohmpilot using DIP switch number 5. See (A).
3. The Modbus address can be set using numbers 1-3.
Default address: 40
(For future applications, the Modbus address can be changed using the DIP switches
on the Ohmpilot.)
(A) DIP switches
DIP 1-3 = Modbus address BCD
DIP 4 = Reserve
DIP 5 = Terminating resistance
(120 Ohm)
Fronius Smart Meter OUTPUT
Fronius
RS 485
Fronius
Datamanager
2.0
INPUT
DT/PE
Ohmpilot
+
120Ω
1 3
Rx / T
-
x GND
4 6 7 9
1
11
2 3 4 5
DA B C
- D+ D-
D+ D- -
120Ω
OFF
(A)
(B)
WARNING! Use a data cable
that is clearly distinguishable
from the mains cable, so that
there is no confusion and
injury and damage to property
are avoided.
IMPORTANT! In the case of incorrect
cabling, this will be displayed by the
red LED ashing 1x.
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