# -*- coding: utf-8 -*-
"""
Created on Wed May 26 08:50:01 2021
@author: Franz
"""

import serial
import tkinter

Fenster = tkinter.Tk()
Fenster.title('ComTest1')
Fenster.geometry('300x300')#Fenstergröße (für Laptop max. 1530x790)
label1 = tkinter.Label(Fenster,text='', width=3,
                       fg='#ff0000', #RGB Farbe Rot
                       bg='#000000', #RGB Farbe Schwarz
                       font=('arial', 100))                
label1.place(x=30, y=20)

ser = serial.Serial(port='COM4', baudrate=9600, parity=serial.PARITY_NONE,\
                    stopbits=serial.STOPBITS_ONE, bytesize=serial.EIGHTBITS,\
                    timeout=0)
print("connected to: " + ser.portstr)

for line in ser.read(): 
    print(str(line))# Ausgabe an Console
    label1['text'] = line # Ausgabe an Fenster 

ser.close()

Fenster.mainloop()