V-TAC VT-6605305 Manuel D'instructions page 37

MONITORING COMMUNICATION
This chapter describes the communication connection of inverter and monitoring system
(Industrial master, private computers, smart phones and so on).
The standard communication mode of grid-tied solar inverter is RS485 which includes
"RS485-M" and "RS485-S" ports. The RS485-M ports can communicate with private
computers, smart phones and so on. The system monitoring solution is shown as Figure
below.
Figure 34 Monitoring system of inverter
STANDARD COMMUNICATION
Table of pins on inverter instruction
Pin on inverter Definition
1(Red) +5VDC
2(Orange) A (RS485+)
3(Brown) B (RS485-)
4(Black) GND