Figure 3-22 Connecting cables
(1) PE (2) AC IN (3) Output ports for fan 1 to
fan 4
(4) Output ports for hydrogen
sensor 1 to hydrogen sensor 4
(5) Hydrogen concentration
alarm port, fan alarm port, and
hardware fault port (reserved
ports)
(6) RS485+, RS485-, GND, and
idle ports (reserved ports)
(7) RS485 port
Table 3-1 Pin mapping for the RS485 port
Pin
Signal Function
Pin 1 (orange-white) D+ RS485+
Pin 2 (orange) D- RS485-
Pin 3 (green-white) 12V+ 12+ input
Pin 4 (blue) NC -
Pin 5 (blue-white) NC -
Pin 6 (green) NC -
Pin 7 (brown-white) NC -
Pin 8 (brown) 12V- 12- input
----End
iMaster NetEco
Device Installation and Commissioning Guide (Data
Center) 3 Installing Devices
Issue 02 (2021-05-12) Copyright © Huawei Technologies Co., Ltd. 32
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