Python下使用串口发送十六进制数据

import serial
from time import sleep

def recv(serial):
    while True:
        data = serial.read_all()
        if data == '':
            continue
        else:
            break
        sleep(0.2)
    return data

if __name__ == '__main__':
    serial = serial.Serial('/dev/ttyUSB1', 115200, timeout=0.5)  #/dev/ttyUSB0
    if serial.isOpen() :
        print("open success")
    else :
        print("open failed")

    number = 0

    while True:
        a='aa aa 00 32 40 20 11 11 00 00'
        data = bytes.fromhex(a)
        number = number + 1
        print("number is:" + str(number))
        #print("write:"+ data)
        sleep(0.2)
        serial.write(data) #数据写回
        sleep(0.2)