Trigger event markers from Eprime to BIOPAC

[Scott]

Never mind, Paul, I've found information about using a *calculated channel*in AcqKnowledge for simplifying  8 digital bit channels into a single 
number from 0 - 255.  My apologies for waking a dead thread to ask a 
question about BIOPAC, even though it's relevant to using E-prime with this 
equipment and software. - Thanks anyway, for a few clues you provided in 
previous posts to this thread.

On Monday, January 14, 2013 12:21:45 AM UTC-6, Scott wrote:
>
>
> I'm not sure I should reply to such an old thread, but I am asking Paul 
> Groot for elaborate regarding part of his post to this topic -- and my 
> question still is about "...markers from E-Prime to BIOPAC."  Can you 
> please explain how one can "...use a calculation channel to convert the 8 
> digital channels back to a numerical one...", if one needs more than 8 
> unique marker codes?
>
> I am just beginning work on  E-Prime programs that will send triggers via 
> the parallel port to Biopac equipment. I have written quite a few E-Prime 
> programs for ERP studies that send codes to Neuroscan amps. For that, it's 
> simple to use different numbers (1-255) to distinguish various kinds of 
> stimulus onset and offset and response events. I think I understand how to 
> send a signal to one of 8 channels of the Biopac recording system using 
> port codes that are powers of 2 (as you explained). However, I don't expect 
> that will always be enough, so I'd like to know how to setup a "calculation 
> channel" to facilitate the use of more than 8 codes with Biopac. Can you 
> explain, or point me to some documentation about this?
>
> Thanks. - Scott
>

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