Huawei SUN2000-75KTL Series - Page 17

16
Connecting RS485 Communications Cables (4–8 mm Four-hole Rubber Plug)
Number of
communications cables
Port
Pin
Definition
Pin
Definition
Description
RS485
-1
1
RS485A IN, RS485
differential signal+
2
RS485A OUT, RS485
differential signal+
Used for cascading
solar inverters or
connecting to devices
such as the
SmartLogger
.
3
RS485B IN, RS485
differential signal
–
4
RS485B OUT, RS485
differential signal
–
Protection
ground
5
PE, shielding ground
6
PE, shielding ground
N/A
RS485
-2
7
RS485A, RS485
differential signal+
8
RS485B, RS485
differential signal
–
Used for connecting to
RS485 slave devices.
Installing the RS485 Communications Cable
4.8
•
The solar inverter supports RS485
communication and MBUS communication. If
the MBUS communication mode is used, you
do not need to connect the communications
cable to the RS485-1 port.
•
This section describes how to connect three
communications cables.
•
When routing communications cables,
separate communications cables from power
cables to prevent communication from being
affected.
Pin Definitions of Communications Ports