Huawei ECC800 - Page 85

ECC800 Data Center Controller
User Manual (for ECC800-Pro)
3 Device Description
Issue 06 (2020-04-22)
Copyright © Huawei Technologies Co., Ltd.
74
COM Port
Figure 3-49 COM port pins
Table 3-74 COM port pin definitions
Pin
Signal
Description
1
RS485+
Two cascaded RS485
communication ports
2
RS485–
3
NC
4
RS485+
5
RS485–
6
GND
7
NC
8
NC
DI and DO Ports
Table 3-75 DI and DO port pin definitions
Pin
Defini
tion
Signal
Descriptio
n
Status Description
Initial
Status
Descriptio
n
1
+
Dry contact
input signal

Open: The dry contact
input is open.

Closed: The dry
contact input is closed.
Open
Dry contact
input and
output
signals
2
–
3
NO
Dry contract

Open: The dry contact
Open