Communication Wiring Board; Rs485 Communication; Interface Description - Sungrow SG33CX User Manual

User Manual
During installation, press the junction box forcibly to ensure that the
pin can be inserted successfully.
Never hit the pin with a heavy object, such a hammer. Otherwise, it
will be irrecoverably.

5.8 Communication Wiring Board

The communication board of the inverter includes two layers. The upper layer
communication board mainly includes RS485 communication interfaces while
the lower layer communication board mainly includes DI/DO interface and DRM
interface.

5.9 RS485 Communication

5.9.1 Interface Description

As shown in the figure below, the inverter is equipped with three RS485
communication interfaces and one dip switch.
Upper layer
RS485-1 interface
RS485
A2 B2
A1 A1 B1 B1
RS485-2 interface
Lower layer
DI DI PGND PGND NC COM NO
Emergency stop dry contact Fault output dry contact
5 Electrical Connection
(RJ45)
RS485-1 dip switch
120ohm
ON
OFF
SW1
RS485-1interface
(terminal block)
CON1
DO
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