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.