User's Manual

Table Of Contents
SmartLogger3000
User Manual
4 Cable Connections
Issue 04 (2020-03-11)
Copyright © Huawei Technologies Co., Ltd.
41
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 on the SmartLogger.
Figure 4-3 Cascading connection
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4.1.4 Connecting an MBUS Cable
Context
If both the SmartLogger and the solar inverter support MBUS, the SmartLogger can be
connected to the solar inverter through an AC power cable. In this case, you do not need to
connect the RS485 communications cable to the solar inverter.
If the SmartLogger uses an AC power cable as the communications cable, an MCB and a
knife fuse switch need to be installed to prevent device damage in the case of short circuits.
The rated power of the PV system connected to the MBUS port on the SmartLogger must be
greater than 75 kW.