[Python] Understand data received from serial with Python [closed]

Good morning, i'm pretty new to read some data from serial device and i don't understand how to reach the goal. I'm a mechanical designer and waiting for the company to hire a programmer i need to reach a goal: read a simple data from a serial communication

I have wrote a little program in Python like this after i have read some document about serial communication and with the help of other user in this forum.

import serial
from time import sleep
port = "COM3"
baudrate = 9600

ser = serial.Serial(port,baudrate,timeout=1,parity=serial.PARITY_NONE,bytesize=serial.EIGHTBITS,stopbits=serial.STOPBITS_ONE)

if ser.is_open == True:
print("Porta " + port + " aperta")
else:
print("porta " + port + " chiusa")

print("dati ricevuti:")

while True:
data = ser.readline()
sleep(0.1)
data_left = ser.inWaiting()
data += ser.readline(data_left)
print (data) #print received data


nothing difficult but the return in terminal is this:

Porta COM3 aperta
dati ricevuti:
b''
b''
b''
b''
b''
b''


All the data are blank and i pretty sure i have to send command first to receive later a response with the data i need. From a program we have i have the possibility to read the data and i have tried to monitor how work with a serial monitor software.



I know this isn't my job but i want to achieve this goal, for me is a little start for other project in the future.

I appreciate any help and, if anyone have some video tutorial or other, link me to
to increase my knowledge.

I try to read some data from a serial communication to manipulate it after.

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