Простейший терминал COM

from PyQt5 import QtCore, QtWidgets, QtSerialPort, QtGui
from PyQt5.QtCore import QSize, Qt, pyqtSignal, QIODevice
from mainwindow import Ui_MainWindow
from PyQt5.QtCore import QThread
import sys
 
class ComPortReceiveThread(QThread):
    def __init__(self, mainwindow, parent = None):
        super().__init__()
        self.mainwindow = mainwindow
 
    def Run(self):
        print("Receive button pushed")
        while True:
            RecData = self.mainwindow.serial.read(self,64)
            print(RecData)
 
 
class ComPortSendThread(QThread):
    def __init__(self, mainwindow, parent=None):
        super().__init__()
        self.mainwindow = mainwindow
 
    def Run(self):
        print("Send button pushed")
        msg = '12345678'
        self.mainwindow.serial.write(msg.encode('ascii'))
 
 
class MyWin(QtWidgets.QMainWindow):
    def __init__(self, parent = None):
        QtWidgets.QWidget.__init__(self,parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
 
        self.serial = QtSerialPort.QSerialPort()
        self.serial.setPortName('COM4')
        if self.serial.open(QIODevice.ReadWrite):
            self.serial.setBaudRate(115200)
 
        self.ui.ReceiveButton.clicked.connect(self.RecFunc)
        self.RecThread = ComPortReceiveThread(mainwindow=self)
 
        self.ui.SendButton.clicked.connect(self.SendFunc)
        self.SendThread = ComPortSendThread(mainwindow=self)
 
    def RecFunc(self):
        self.RecThread.start()
 
    def SendFunc(self):
        self.SendThread.start()
 
 
class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(400, 250)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.DataBrowser = QtWidgets.QTextBrowser(self.centralwidget)
        self.DataBrowser.setGeometry(QtCore.QRect(20, 20, 250, 180))
        self.DataBrowser.setObjectName("DataBrowser")
        self.SendButton = QtWidgets.QPushButton(self.centralwidget)
        self.SendButton.setGeometry(QtCore.QRect(280, 80, 100, 40))
        self.SendButton.setObjectName("SendButton")
        self.ReceiveButton = QtWidgets.QPushButton(self.centralwidget)
        self.ReceiveButton.setGeometry(QtCore.QRect(280, 140, 100, 40))
        self.ReceiveButton.setObjectName("ReceiveButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 400, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
 
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
 
    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.SendButton.setText(_translate("MainWindow", "Send"))
        self.ReceiveButton.setText(_translate("MainWindow", "Receive"))
 
 
 
app = QtWidgets.QApplication(sys.argv)
screen = MyWin()
screen.show()
sys.exit(app.exec_())