Modbus addressing by listening to a serial port and with OCR in python

The idea is to experiment and listen to the frames of the modbus master and slave (Any RS485 modbus slave), you can simulate the HMI with Weintek, for example, with a camera to capture images of the HMI and using OCR (artificial vision) in Python Windows to match the variables found with the memory table that is running, you can virtualize com ports. you can simulate the communication of any process