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Installation and Operation Manual for RPI M6A M8A M10A inverters V1.0 2016-02-03
5 Planning the installation
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 software updates.
To ensure the proper work of the data connection, consider the
following recommendation and instructions.
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 resistor, 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 inverter.
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 be kept separate from the AC
cable and the DC cables to avoid interferences.
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