RS485 Pinout when using PyModbus

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Windows Central Question

I am trying to control a RS-485 RTU device (Love 16C-3) using a Python script (pymodbus library) that runs on a Windows 10 PC. The hardware is connected to the computer using a USB-RS232 cable.

In my initial test, the Python script is not able to read anything off the RS-485 device.

What is the RS-485 pin out for the DB9 connector?
Should a USB-RS485 cable be used instead?
 

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