AVer System Contrll Pro User Manual (NV version) - Manual (Page 15)

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3.
Set the DIP switch of the RS232 to RS485 converter at 4-wire RS485 setting.
4. Using the screwdriver to lose the pin hole of RS485 to RS232 converter. And then, insert
another side of single core wire into the pin hole of the RS485 to RS232 converter. Using the
screwdriver to screw tight the wire. Please refer to the below table for pin-hole matching:
RS485 pin hole of System Controller
RS485 to RS232 Converter site System Controller site
R+ T+ 1
R- T- 2
T+ R+ 3
T- R- 4