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-   -   Output port to cedrus StimTracker device (http://community.cedrus.com/showthread.php?t=1852)

SylviaG October 8th, 2013 01:51 PM

Output port to cedrus StimTracker device
 
I was able to test that the presentation software is interfacing with the stimtracker. The problem that I am having now seems to be with the code sequence. I'm not sure I understand the sequencing for communicating with stimtracker.
I see how mp\x0A\x00\x00\x00 = 10, but I'm not sure I understand how mp\xE8\x03\x00\x00 = 1000 from the Presentation wiki (http://www.neurobs.com/wiki/Presenta...us_StimTracker). Also, it seems that every odd code I send, sends the same code sequence to the Biosemi software (decimal value = 128). Thanks for the help.

psycit@vuw.ac.nz October 8th, 2013 03:16 PM

Hi Sylvia G

Not sure if you are using http://www.cedrus.com/support/stimtr...activetwo.htm?
If you are sending event code make sure that you are checking on the bits that correspond to what ever you want to record.

The link above shows
Event marker bit 0 Trig. 8 / 128
Event marker bit 1 Trig. 9 / 1 (MSB)
Event marker bit 2 Trig. 10 / 2

sending event marker on every bit will signal a corresponding decimal values in your BioSemi Software (I assume?)

See my posting if it will help you :-)
http://community.cedrus.com/showthread.php?t=1844

Cheers

Al

Hisham October 21st, 2013 05:19 PM

The mp command sets the pulse duration for subsequent uses of the mh command. But the mp command will not send a pulse if used by itself.

Meanwhile, a new web page was created this morning that illustrates how to use a terminal emulation program to send commands to StimTracker. It could serve as a useful stepping stone prior to writing code that interacts with StimTracker.

SylviaG October 22nd, 2013 08:28 AM

Thank you so much for the response. It was very helpful. I was able to download and install the RealTerm software and was able to get the "Markers" Blue LED light on the front panel of the StimTracker to activate. I think the problem must be with how I setup the BioSemi Actiview software because I'm still not seeing the corresponding 255 value on the EEG computer.


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