pyserial test program

import serial
import time
s=serial.Serial('COM180',baudrate=115200,bytesize=8,stopbits=1,parity='N')
# s.open()

s.write(b'xxxxxA\r\n')
print(s.read_until(size=8))
time.sleep(2)
s.write(b'xxxxxB\r\n')
print(s.read_until(size=8))
time.sleep(2)
s.write(b'xxxxxx\r\n')
print(s.read_until(size=8))

s.close()