
SUN2000-(33KTL, 40KTL)-JP
User Manual
5 Electrical Connections (2-pin Spot-Check Terminal)
Issue 07 (2019-06-30)
Copyright © Huawei Technologies Co., Ltd.
57
5.5.2 Connecting RS485 Communications Cables
Context
Connect an RS485 communications cable.
An RS485 communications cable can be connected in two ways:
−
Terminal block connection
You are advised to use a communications cable with the conductor cross-sectional
area of 1 mm
2
and outer diameter in the range of 14 mm to 18 mm.
−
RJ45 network port connection
You are advised to use a shielded RJ45 connector and a CAT 5E outdoor shielded
network cable with an outer diameter less than 9 mm and internal resistance not
greater than 1.5 ohms/10 m.
Select either connection mode during installation. Connecting to a terminal block is recommended.
When laying out communications cables, separate them from power cables and keep them
away from strong signal sources to avoid communication interference.
Functions of the RS485 terminal block
Figure 5-23
Terminal block