Python 串口通訊操作

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下載  pyserial包 https://pypi.python.org/packages/source/p/pyserial/pyserial-2.7.tar.gz#md5=794506184df83ef2290de0d18803dd11

然後解壓,例如解壓到D:/pyserial.開啟cmd，cd 指令切換到D:\pyserial下。執行安裝指令 python setup.py install

編寫測試代碼。

def OpenCom(self,*args):        #設定連接埠和傳輸速率        selComPort =‘com2’        #傳輸速率        selBaudRate =9600       #同位        selParity = ‘N‘        try:            if(not self.mySerial):                self.mySerial = serial.Serial(port=selComPort, baudrate=selBaudRate,bytesize=8,parity=selParity,stopbits=1,timeout=5)            else:                if(self.mySerial.isOpen()):                    self.mySerial.close()                    self.mySerial = serial.Serial(port=selComPort, baudrate=selBaudRate, bytesize=8, parity=selParity, stopbits=1, timeout=5)            self.lblInfo[‘text‘] = ‘開啟成功！‘        except Exception as ex:            self.lblInfo[‘text‘] = ‘開啟失敗！‘

#使用com口發送modbus協議給終端裝置。

    def btnEmId_Click(self):

         barray = bytearray([0x05, 0x03, 0xA#, 0x54, 0x00, 0x08])

        vOldEmId = self.txbOldEmId.get()

        vNewEmId = self.txbNewEmId.get()

        barray[0] = int(vOldEmId)

        barray[5] = int(vNewEmId)

       #crc校正

        strInput  = utils.crc16_append(barray)

        print(barray)

        n = self.mySerial.write(barray)

        if(n > 0):

            str = self.mySerial.readall()

            self.lblInfo[‘text‘] = ‘success！‘

            # for s in str:

            #     print (hex(s))

        else:

　　　　self.lblInfo[‘text‘] = ‘erroe！

　　

Python 串口通訊操作