Wiring of an inverter with rs485 at a pc – SMA 485PB-NR Benutzerhandbuch
Seite 25
SMA
Technologie AG
Retrofitting the Communication Interfaces
Short Description
PB-NR-IXX073014
Page 25
Wiring of an inverter with RS485 at a PC
GND
DATA+
max. 50
inverter on
RS485 bus
Connect shield
to case
Connect shield
to case
10-pin terminal
on the interface
converter I-7520
D-SUB 9 socket on
the interface converter
I-7520
PC running
Sunny Data Control
+10V ... 30V DC
Interface Converter
RS485 / RS232
I-7520
9
1
2
3
5
2
DATA-
10
7
5
7
5
2
2
3
5
2
iYCY twisted pair cable
iYCY twisted pair cable
External
Power Supply
Betrieb
Operatio
n
Erdschluss
Earth Fault
Störung
Failure
Photovo
ltaik-
String
wechsel
richter
Photov
oltaic
string in
verter
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".