Sungrow SG250HX-US, User Manual

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There are four communication terminals COM1, COM2, COM3 and COM4 on the
bottom of the inverter. Select the communication terminal according to onsite
conditions.
Disconnector (≥ 800Vac) and fuse (16A, gM) should be installed between the in-
verter and the tracking system control cabinet.
Length of the cable connecting the internal wiring terminal of the inverter and the
fuse should be less than 2.5m.
5.10 RS485 Connection
5.10.1 Interface Description
The following figure shows the position of the communication wiring board in the inverter as
well as the terminals equipped for the wiring board.
*The reserved port is not available for the time being.
The inverter is equipped with two sets of RS485 communication terminals: RS485_1 port
and RS485_2 port.
User Manual 5 Electrical Connection