Eyelink connection issue

Support
1

Hello Chris,

I am trying to use an Eyelink 1000 with Mworks but I get an error. I have installed all the necessary software and tried one of the eyelink example experiments from sr-research which works fine and establishes a connection with the tracker. I found a similar error in another discussion but restarting the display computer didn’t help.

That’s the error.

ERROR: Failed to connect to Tracker at 100.1.1.2
ERROR: Error, Eyelink Connection could not be established
ERROR: Can’t start iodevice (Eyelink 1000) and no alt tag specified
Extended information:
parser_context: mw_finalize

Thanks in advance,

Cheers,
Beshoy

2

Hi Beshoy,

Are you sure that 100.1.1.2 is the correct IP address? When I’ve set up EyeLink’s in the past, I believe 100.1.1.2 was the manually-configured address of the Mac running MWServer, and the tracker’s address was 100.1.1.1. Your configuration may differ, though.

Apart from that, I’m not sure what to suggest.

Chris

3

Hi Chris,

It’s the IP that was mentioned in the manual. I tried the calibration experiment provided with from sr-research and it works fine; that makes me think that i configured the IP correctly.
In any case, is there a way to find out the correct IP from the eyelink computer? The same IP address should be used to set up the ethernet connection in the Mac running the experiment as well as the eyelink IO device in Mworks, right?

Cheers,
Beshoy

4

Hello Chris,
You are right, I tried the addresses you used and it worked. I was a bit confused and thought the same IP address is used in configuring the ethernet connection as well as the tracker’s ip in mworks.
I have another question however, i can’t see the blue trace of the eye. I can see only a red cross where the eye is looking; any particular option to change to enable the blue trace?

Regards,
Beshoy

5

Hi Beshoy,

You are right, I tried the addresses you used and it worked.

Great!

i can’t see the blue trace of the eye. I can see only a red cross where the eye is looking; any particular option to change to enable the blue trace?

Do you mean you don’t see the eye trace in MWClient’s eye window? If so, then there’s a couple things to check:

  • Click the eye window’s “Options…” button, and make sure that the “X”, “Y”, and “Saccade” fields contain the correct variable names.

  • Check the range of values you’re getting in the eye position variables. The values reported by the EyeLink are in “screen gaze” coordinates (pixels, I think), whereas the eye window wants positions in degrees. To convert between them, generally one uses an eye calibrator. That said, I know some folks in my lab have had issues using MWorks’ standard eye calibrator with the EyeLink 1000. Maybe your best bet would be to check with Ralf Brockhausen or someone else from DPZ about best practices?

Cheers,
Chris

6

Hi Chris,

Sorry for not getting back to you earlier. I use the eye calibrator in Mworks, i basically run the same experiment as we do with the NHP but with eyelink 1000 instead of the plus model. I have tried putting the variables in the options section of the eye window but nothing. I just see the red cross showing where the person is fixating, but it’s a bit delayed.

I will try contacting Ralf then. Thanks

Cheers,
Beshoy