serial.py

import serial
import time

ser = serial.Serial('/dev/ttyS0', 115200)

def toDecimal(some_string):
    decimals = [ord(c) for c in some_string]
    return bytes(decimals)
    
#if not ser.isOpen():
    #ser.open()
    
while True:
    t = ser.read()
    print(t)
    #print ('%x' % ord(t))

#ser.read()