Rs485 Communication System - Sungrow SG33CX User Manual

5 Electrical Connection
All the three interfaces can be connected to a data acquisition device (Logger),
to achieve data exchange with PC or other monitoring devices.
The RS485-2 interface can only be applied to the application scenario of single
inverter communication.
The RS485-1 terminal block and the RJ45 interface can be applied to
applications where multiple inverters communicate in a daisy-chain form.
A 120Ω resistor can be connected in parallel between RS485-1 A/B pins by
configuring the dip switch.
RS485-1 terminal block interface and RJ45 interface serve as the same
function with wiring manner different.

5.9.2 RS485 Communication System

Single-inverter communication system
In case of a single inverter, communication cable connection requires only one
RS485 cable.
44
RS485-1 interface
(RJ45)
RS485
A2 B2
A1 A1 B1 B1
RS485-2 interface
User Manual
RS485-1 dip switch
120ohm
ON
OFF
SW1
RS485-1interface
(terminal block)