Huawei SUN2000L - Page 59

SUN2000L-(2KTL-5KTL)
User Manual
5 Electrical Connections
Issue 02 (2017-12-12)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
52
Table 5-3 COM port pin definitions
No.
Label
Definition
Description
1
485B1
RS485B, RS485 differential
signal–
Reserved, can connect to the
RS485 signal port on the
power collector.
2
485A1
RS485A, RS485 differential
signal+
3
485B2
RS485B, RS485 differential
signal–
Reserved, can connect to the
RS485 signal port and
enable signal port on a
battery.
4
485A2
RS485A, RS485 differential
signal+
5
EN–
Enable signal–
6
EN+
Enable signal+
7
N/A
N/A
N/A
8
PE
Shielding ground
Connects to the shield layer
of the cable.
The ALARM port provides an alarm signal port to connect to an alarm beacon, which reminds
the user to handle the Low Insulation Resistance, Abnormal Residual Current, or Faulty
Residual Current Sensor alarm. The ALARM port reserves an RS485/12 V signal port.

The alarm beacon should be installed within 2 meters away from the SUN2000L.

The Faulty Residual Current Sensor alarm is the Abnormal Device alarm with a cause ID
of 5.
Table 5-4 ALARM port pin definitions
No.
Label
Definition
Description
1
ALARM–
Alarm signal–
Reserved, can connect to the
power port on an alarm
beacon
2
ALARM+
Alarm signal+
3
485B3
RS485B, RS485 differential
signal–
Reserved RS485/12 V
signal port, output power of
the 12 V power supply ≤ 3
W
4
485A3
RS485A, RS485 differential
signal+
5
12 V–
Negative of the 12 V power supply
6
12 V+
Positive of the 12 V power supply
7
N/A
N/A
N/A