Communications
Port
Communications
Parameter
Communications
Protocol
Function
NOTE
All these ports are protected by a security mechanism.
Figure 1-6 Pins in the COM port
Table 1-9 Pin definitions for the COM_IN port
Pin
Signal
Description
1
RS485+
RS485 data +
2
RS485-
RS485 data -
3
12 V
Power supply
4
RS485+
RS485 data +
5
RS485-
RS485 data -
6
I
2
C_SCL
I
2
C clock signal
7
I
2
C_SDA
I
2
C data signal
8
GND
Grounding (PE)
Table 1-10 Pin definitions for the COM_OUT1, COM_OUT2, and COM_OUT3 ports
Pin
Signal
Description
1
RS485+
RS485 data +
2
RS485-
RS485 data -
3
12 V
Power supply
4
RS485+
RS485 data +
5
RS485-
RS485 data -
6, 7
–
-
8
GND
Grounding (PE)
SMU11B Site Monitoring Unit
User Manual
1 Description of Components
Issue 03 (2022-06-06)
Copyright © Huawei Technologies Co., Ltd.
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