Python Serial communication operation

Download Pyserial Package Https://pypi.python.org/packages/source/p/pyserial/pyserial-2.7.tar.gz#md5=794506184df83ef2290de0d18803dd11

Then unzip, for example, unzip to d:/pyserial. Open the CMD,CD command to switch to D:\pyserial. Execute installation Instructions Python setup.py install

Write the test code.

def opencom (Self,*args):        #设置端口和波特率        selcomport = ' com2 '        #波特率        selbaudrate =9600       #奇偶校验        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 '] = ' open successfully! '        except Exception as ex:            self.lblinfo[' text '] = ' open failed! ‘

#使用com口发送modbus协议给终端设备.

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校验

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 Serial communication operation