Sungrow SG1K5TL-31, User Manual

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Electrical Connection
5
43
5.9.2
Connecting RS485 Cable
RS485 is communication standard for bidirectional transmission of data between
more than one inverter and a PC or a data logger.
If there is more than one inverter to communicate with a PC or a data logger, it is
crucial to configure communication parameters of each inverter. See “8.8.7
Communication Parameters Settings”. And the maximum number of connected
inverters in a daisy chain is dependent on the converter device. Please refer to the
corresponding manual.
RS485 bus’ requirements to ensure quality of communication:
z
Shielding twist-pair type
z
Shielding layer of RS485 bus should be single-point grounding
SolarInfo logger and RS485-232 converter are optional parts and can be ordered from
Sungrow.
z
Data logger
A1
A B B A B A
B1
Inverter 1 Inverter 2 Inverter n
SolarInfo logger
...
Step 1: A 120 Ω resistance is connected between RS485 A and RS485 B of the first
inverter.
Step 2: Connect RS485 A of Inverter 1 to RS485 A of inverter 2.
Step 3: Connect RS485 B of Inverter 1 to RS485 B of inverter 2.
Step 4: Connect other inverters in the same way.