Three-phase photovoltaic grid-connected inverter Monitoring communication
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7.1 Standard communication
The standard communication mode for three-phase PV grid-connected inverter is RS485, and
there are two c
ommunication interfaces which are “RS485” and “EXT”. These two communication
interfaces can be used in the communication with PC and smart phone to achieve monitoring of
the inverter. The monitoring system solution is shown in fig 7.1.
Fig 7.1 Inverter monitoring system
Table 7-1 Instruction for communication connector interfaces
Pin of inverter communication connector
Pin definition
1(Red)
+5VDC
2(Orange)
A(RS485+)
3(Brown)
B(RS485-)
4(Black)
GND
