usb reciever output

[MathewS]

I was recently conducting some trials on some custom C++ software for data acquisition on the BioSemi ActiveTwo and I came up with a peculiar problem. When I use the USB receiver with the eye tracker hardware the sync byte is nearly always out of sync. With the same code and using the USB receiver without the jazz eyetracker hardware embedded it syncs fine. Is this because with the USB reciever with the eyetracker hardware outputs a different number of channels than the ones outlined in http://www.biosemi.com/faq/adjust_samplerate.htm ?

Thanks

[Coen]

With the Jazz enabled (output trigger is 16 High), the special Jazz version of the USB receiver adds 4 extra channels to the data stream. Inspect the LabVIEW code of the subvi named Act_Jazz.vi to learn about how the Jazz information is embedded in the 4 extra channels (it's quite complex).

With the Jazz disabled (output trigger 16 is Low), the USB receiver with Jazz input works exactly the same as the standard USB receiver.

Best regards, Coen (BioSemi)