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000440AG
5 - Installation
S
erial Connection Communication (RS485)
On the inverter there is a RS485 communication line, dedicated to con-
necting the inverter to monitoring devices or to carrying out “daisy-chain”
(“in-out”) connections of multiple inverters. The line may also be used to
store settings with the dedicated advanced configuration software.
Cables connecting the RS485 line may use two different types of con-
nection:
• Connection of the conductors using the
terminal connectors
18
(+T/R, -T/R, SLCD and RTN)
The SLCD connection must be used for connecting the shielding boot(s)
of the cable(s).
• Connection of conductors with RJ45 connectors
19
The two RJ45 connectors RS485(A) and RS485(B) available for the
RS485 communication, are equivalent to each other and can be used
interchangeably for the arrival or for the output of the line in realising the
daisy chain connection of the inverters.
The same is true for connections made using the terminal connectors
18
.
Table: crimping diagram for RJ45 connectors
Pin No.
Function
1 8
3
+T/R
4
+R
5
-T/R
7
RTN
1, 2, 6, 8
not used
Use a connector with metal body to provide cable shield continuity!
For long distance connections, the connection on terminal connector is
preferable using a shielded twisted pair cable with characteristic impe-
dance of Z0=120 Ohm like the one shown on the following table:
Signal
Symbol
-T/R
+T/R
RTN
-T/R
+T/R
RTN
SLCD
SLCD
Positive data
+T/R
Negative datum
-T/R
Reference
RTN
Shield
SLCD
Shield continuity must be provided along the communication line using the SLCD terminal
and must be grounded at a single point.
IN
OUT
19
RS485
R
RTN
SLCD
REMOTE
5V
RTN
R
R
18