Landis+gyr g350 IR readout

Im trying to do a readout on a landis+gyr g350. i have ab IR head which works just fine on my iskra MT171.

when i just send /?! i get =========================
/?!
as output

when i send: /?!\r\n. 2F 3F 21 0D 0A

i get this as output: /?!
. 2F 3F 21 0D 0A

here is my python script im using:

import time
import serial
import re

ser = serial.Serial(
port='/dev/ttyUSB0',
baudrate=300,
parity=serial.PARITY_EVEN,
stopbits=serial.STOPBITS_ONE,
bytesize=serial.SEVENBITS,
)

while 1:
ser.flushInput()
ser.write('/?!\r\n. 2F 3F 21 0D 0A')
time.sleep(15)
output=ser.read(ser.inWaiting())

print output

print '========================='
ser.flushInput()