5 Planning the installation
Installation and Operation Manual for RPI M50A
32
5.9 Connecting to a datalogger via
RS485
The inverter can be connected to a datalogger via
RS485, e.g. for monitoring, changing settings or soft-
ware updates.
To ensure the proper work of the data connection,
consider the following recommendation and instruc-
tions.
For a detailed description how to perform the activities
described in this section, see “6.7 Connecting commu-
nication port I (optional)”, p. 45.
When you connect a single inverter
● The termination resistor has to be switched on.
When you connect multiple inverters within the
same PV system
● On the last inverter in the chain, the termination
resistor has to be switched on.
● If your datalogger has no internal termination re-
sistor, the termination resistor on the rst inverter
in the chain has to be switched on too.
● To each inverter a different inverter ID has to be
applied. This is necessary, so that the datalogger
or the maintenance software can identify each
inverter in the chain.
● The baud rate has to be the same on each in-
verter.
Cable and wire requirements
● Twisted and shielded cables with 2 solid wires.
● Cable diameter: 5 mm
● Wire cross-section: 1 mm
2
● The RS485 cables should lay with distance from
the AC cable and the DC cables to avoid interfer-
ences.
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