Connecting To An Emi; Connection Description; Connecting The Smartlogger To An Emi That Supports Standard Modbus-Rtu - Huawei SmartLogger1000 User Manual

SmartLogger1000
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Figure 4-21 Connecting Multiple Inverters to the SmartLogger

4.5 Connecting to an EMI

4.5.1 Connection Description

There are two types of EMI. One is the standard EMI that supports the Modbus-RTU protocol,
and it can directly connect to the SmartLogger. The other is the EMI that is composed of
sensors, whose signals need to be converted into RS485 signals (Modbus-RTU) over an extra
analog-to-digital converter before the sensors are connected to the SmartLogger.
4.5.2 Connecting the SmartLogger to an EMI That Supports
Standard Modbus-RTU
Context
The SmartLogger can connect to an EMI that supports the standard Modbus-RTU protocol.
One SmartLogger can connect to and manage only one EMI.
Issue 12 (2019-01-15)

A maximum of 80 devices can be connected to one SmartLogger. You are advised to connect fewer
than 30 devices to each RS485 route.

The addresses for all devices in the daisy chain should be within the searching scope set in the
SmartLogger and they must differ from each other. Otherwise, the communications would fail
between the device and the SmartLogger.
 If the firmware version of the SUN2000 is V100R001C00SPC010 or later, or
V100R001C81SPC105 or later, you can perform Auto Assign Address on the SmartLogger. If
detecting that an RS485 address is repeatedly used, the SmartLogger automatically allocates another
address and hence no local operation is required.

Baud rate of all the devices in one daisy chain should stay consistent with those of the
SmartLogger.
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