Huawei SMU11B User Manual page 13

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