python read rfid name from use ttl

#!/usr/bin/python
# read more command
# http://www.elechouse.com/elechouse/images/product/13.56MHZ_RFID_Module/13.56MHZ_RFID_Manual.pdf

import serial
ser = serial.Serial(
    port='/dev/tty.SLAB_USBtoUART',
    baudrate=9600,
    parity=serial.PARITY_NONE,
    stopbits=serial.STOPBITS_ONE,
    bytesize=serial.EIGHTBITS
)


command = bytearray([0x02])
ser.write(command)
while 1:
    while ser.inWaiting():
        s = ser.read()
        print(hex(ord(s)))
ser.close()