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 first 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
●
The RS485 cables should be kept separate from the AC
cable and the DC cables to avoid interferences.
Installation and Operation Manual for RPI M6A M8A M10A inverters V1.0 2016-02-03
2
5 Planning the installation
31