Installing The Rs485 Communications Cable - Huawei SUN2000 Series Quick Manual

4.8

Installing the RS485 Communications Cable

•
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.
Port Pin Definition
RS485A IN, RS485
1
differential signal+
RS485-1
RS485B IN, RS485
3
differential signal–
Protection
5 PE, shielding ground
ground
RS485A, RS485
RS485-2 7
differential signal+
Connecting RS485 communications cables (4–8 mm four-hole rubber plug)
Pin Definitions of Communications Ports
Pin Definition
RS485A OUT, RS485
2
differential signal+
RS485B OUT, RS485
4
differential signal–
6 PE, shielding ground
RS485B, RS485
8
differential signal–
Number of communications
cables
15
Description
Used for cascading
solar inverters or
connecting to devices
such as the
SmartLogger.
N/A
Used for connecting to
RS485 slave devices.