User Manual of A90 Series Inverter Note: 1: For the inverter of 90KW and above, the switch S2 is unavailable and M1 is for analog voltage output. 3.3.7 Wiring of 485 communication terminals The communication terminals A+ and A- are the RS485 communication interfaces of the inverter. The online control of the host (PC or PLC controller) and inverter is performed through the connection and communication with the host. The connection of the RS485 and RS485/RS232 adapters to A90 series inverter is shown in Fig. 3-15, Fig. 3-16 and Fig. 3-17. Direct connection of the RS485 terminal of a single inverter to the host for communication:
Inverter A+ + terminal RS485 communication interface of host A- - terminal OFF GND S5/S1 GND Fig. 3-15 Communication Terminal Wiring of Single Inverter Note: 1: The resistor switch S5 is used for the 458 communication terminal of the inverter of 75KW and below, and S1 for the inverter of 90KW and above. Connection of the RS485 terminals of multiple inverters to host for communication: 42 M2 is for analog current output