Huawei SUN2000-2KTL-L0 Quick Manual page 12

(Optional) Installing the RS485 Communications Cable
4.5
 When laying out communications cables, separate them from power cables to avoid strong
signal interference sources.

Ensure that the exposed core wire is totally inserted into the cable hole and connected securely.
 If only one signal cable needs to be connected, block the unused cable hole on the seal using
a cap and tighten the cable gland.
 If two signal cables are required, ensure that they have the same outer diameter.
No. Label Definition
1 485B1 RS485B, RS485 differential signal–
2 485A1 RS485A, RS485 differential signal+
3 485B2 RS485B, RS485 differential signal–
4 485A2 RS485A, RS485 differential signal+
5 12V– Negative of the 12 V power supply
6 12V+ Positive of the 12 V power supply
7 N/A N/A
8 PE Grounding the shield layer
COM port (COM)
Description
Reserved, can connect to the RS485 signal
port on the energy meter.
Reserved, can connect to the RS485 signal
port on SmartPSB2000L smart PV safety
box.
N/A
Connects to the shield layer of the cable.
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