Huawei SmartLogger3000 - Connecting the RS485 Communications Cable

4.2.5 Connecting the RS485 Communications Cable
Context
● The SmartModule can connect to RS485 communications devices, such as a
solar inverter, an EMI, a power meter, and a PID over COM ports.
● Ensure that RS485+ is connected to COM+ of the SmartModule and RS485– is
connected to the COM– of the SmartModule.
Procedure
Step 1 Connect the RS485 communications cable.
Figure 4-17 Connecting an RS485 communications cable
Port Silk Screen Description
COM1, COM2, and
COM3
+ RS485A, RS485 dierential
signal+
– RS485B, RS485 dierential
signal–
Step 2 If devices need to be cascaded, cascade the devices and then connect them to the
SmartModule.
NO TICE
● You are advised to connect fewer than 30 devices to each RS485 route.
● The baud rate, communications protocol, and parity mode of all devices on an
RS485 cascading link must be the same as those of the COM port of the
SmartModule.
SmartLogger3000
User Manual 4 Cable Connections
Issue 10 (2022-08-20) Copyright © Huawei Technologies Co., Ltd. 56