Lakeshore 336 No Serial Connection

I am using a GPIB connection to connect to a lakeshore 336 temperature controller.
I would like to run the controller using Python. In writing the following I receive a "no serial connection error"

Code:
from lakeshore import Model336
LS=Model336()

Error:

Traceback(most recent call last):
File "C:/Users/Lab/Documents/CV Programs/LossTangentTemp.py", line 17, in <module>
LS=Model336()
File "C:/Python27\lib\site-packages\lakeshore\model_336.py", line 28, in __init__(handshaking, timeout, ip_address, tcp_port,**kwargs
File "C:/ Python27\lib\site-packages\lakeshore\generic_instrument.py", line 39, in __init__(timeout, handshaking, flowcontrol)
File "C:/ Python27\lib\site-packages\lakeshore\generic_instrument.py", line 165, in connect_usb (raise InstrumentException("No serial connections found")
InstrumentException: No Serial Connections Found

In checking the connection using NI Max it seems the instrument can be found and read by the computer.
Any help on this would be appreciated.