Huawei SMU11B - Page 13

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 denitions 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 denitions 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. 7