Huawei SUN2000 L1 Series Quick Manual page 12

COM Port Pin Definitions
Connecting Signal Cables
No. Label Definition
1 RS485B, RS485
485B1
differential signal–
2 RS485A, RS485
485A1
differential signal+
3 RS485B, RS485
485B2
differential signal–
4
RS485A, RS485
485A2
differential signal+
5 GND GND of the enable
signal/12V/DI1/DI2
6 EN+ Enable
signal+/12V+
7 DI1 Digital input signal
1+
8 DI2 Digital input signal
2+
Number of Communications
Cables
11
Description
Solar inverters cascading
scenario: used for connecting to
the solar inverters.
Used for connecting to the
RS485 signal ports of the
battery and power meter. When
both battery and power meter
are configured, they need be
crimped to the 485B2 and
485A2 ports.
Used for connecting to GND of
the enable signal/12V/DI1/DI2.
Used for connecting to the
enable signal of the battery and
the 12V positive signal.
Used for connecting to the DI1
positive signal. It can be used
for connecting to the DRM0
scheduling signal or reserved
for the rapid shutdown signal.
Used for connecting to the DI2
positive signal. It can be
reserved for the feedback signal
of the Backup device.
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