SMA 485PB-NR - Handbuch (Seite 26)

SMA Technologie AG Retrofitting the Communication Interfaces
Short Description PB-NR-IXX073014 Page 26
Wiring of an inverter with RS485 at a Sunny Boy Control
GND
DATA+
max. 50
inverter on
RS485 bus
Connect shield
to case
Connect shield
to case
The termination resistor and the
pull-up/pull-down resistors are activated
according to the technical documentation
of the Sunny Boy Control
7
5
2
LLiYCY twisted pair cable
LiYCY twisted pair cable
Betrieb Operation Erdschluss Earth Fault
Störung Failure
Photovoltaik-Stringwechselrichter Photovoltaic string inver ter
Sunny Boy Control
with RS485 Piggy-Back
on COM1
5
3
8
DATA-
5
7
2
Betrieb Operation Erdschluss Earth Fault
Störung Failure
Photovoltaik-Stringwechselrichter Photovoltaic string inver ter
The last inverter on the
RS485 bus must be terminated.
This is done by mounting jumper
"A" on the system control board,
or by installing a 120 Ohm resistor
between connector "2" and
connector "7".
3 1