Huawei SUN2000-100KTL-M2 Quick Manual page 16

Connector connection:
4.8 Installing RS485 Communications Cables
•
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
15