Trying w/ tfmini from some source online...

import serial
import time

ser = serial.Serial('/dev/ttyS1', 115200, timeout = 1)

ser.write(0x42)
ser.write(0x57)
ser.write(0x02)
ser.write(0x00)
ser.write(0x00)
ser.write(0x00)
ser.write(0x01)
ser.write(0x06)

while(True):
    while(ser.in_waiting >= 9):
        if(('Y' == ser.read()) and ('Y' == ser.read())):
            Dist_L = ser.read()
            Dist_H = ser.read()
            Dist_Total = (ord(Dist_H) * 256) + (ord(Dist_L))
            for i in range (0,5):
                ser.read()
        #time.sleep(0.0005)
        print Dist_Total