psychopy and pyxid

Dear All,

I am having some problems with my Lumina LSC-400 and Psychopy (1.84.1) on Windows 7.

The Lumina box is working fine with Presentation, E-prime and PsychToolBox.

It is connected to a Sunix serial interface card, with the serial port assigned to be COM1.

If I follow the pyxid examples I cannot get Psychopy to recognise the Lumina (it moans about returning {} instead of a integer or string). Sorry I don’t have the exact error. On the Lumina box I have tried selecting both Lumina and Cedrus RB mode (and a range of baud rates), nothing works.

I have also tried calling get_xid_devices() multiple times, again no joy.

Does anyone have any tips on how to troubleshoot this?

Best wishes,


more info

If I just add in the cedrus module into a standard builder view experiment in psychopy then run it, I get the following output:

ERROR could not find a Cedrus device

If instead I create a python script (using the CEDRUS suggested code) and put the following in:

NOTE: I did use the proper indentation - it just doesn’t seem to have come through in the quoted text.

import pyxid

get a list of all attached XID devices

devices = pyxid.get_xid_devices()
devices = pyxid.get_xid_devices() # twice as per suggestion on Cedrus forum

dev = devices[0] # get the first device to use
if dev.is_response_device():

while True:
    if dev.response_queue_size() > 0:
        response = dev.get_next_response()
        # do something with the response

Then I get the following:

####### Running: C:\Users\fmri\Documents\PsychoPy\cedrusTest2 #######
Traceback (most recent call last):
File “C:\Users\fmri\Documents\PsychoPy\cedrusTest2”, line 6, in <module>
devices = pyxid.get_xid_devices()
File “build\bdist.win32\egg\”, line 19, in get_xid_devices
File “build\bdist.win32\egg\pyxid\”, line 17, in init
File “build\bdist.win32\egg\pyxid\”, line 27, in available_ports
File “build\bdist.win32\egg\pyxid\”, line 72, in available_ports
File “C:\Program Files\PsychoPy2\lib\site-packages\serial\”, line 31, in init
super(Serial, self).init(*args, **kwargs)
File “C:\Program Files\PsychoPy2\lib\site-packages\serial\”, line 162, in init
self.port = port
File “C:\Program Files\PsychoPy2\lib\site-packages\serial\”, line 206, in port
raise ValueError(’“port” must be None or a string, not {}’.format(type(port)))
ValueError: “port” must be None or a string, not <type ‘int’>

Please can anyone help with this as I was hoping to use the Lumina with PsychoPy to run an experiment this week - and I’m completely stuck without it.

Best wishes,


Jon, where did you get your pyxid? If it’s from pypi, that version is at least 5 years old. The latest version is always available on GitHub.

As a general note: if our software is having trouble detecting an XID device, putting it in various different modes will not help.