USB port TMS

[David McFarlane]

Peter,

Good question, wish I knew the answer.  We have been using a 
different product from MCC, and using the A/D output to present 
analog waveforms to subjects.  Aside from any latency in starting the 
waveform, the timing within the waveforms looks just fine on my 
oscilloscope (waveform timing is handled internally by the MCC device 
with its own clock).  However, for this study we are not too 
concerned about waveform onset latency, so I have not been asked to 
look at that, let alone timing of straight digital I/O.  We really 
need someone to do that for us.

Beyond that I would just look and see what they say at the MCC site, 
or contact them directly, but anyone could do that without me.

-- David McFarlane, Professional Faultfinder


At 5/31/2010 06:18 PM Monday, Peter Quain wrote:

>what about timing issues David - anything to be aware of?
>
>At 08:20 AM 1/06/2010, you wrote:
>>Sara,
>>
>>Come to think of it, there is a way to send & receive data through 
>>USB using E-Prime, in fact I am doing that for a project 
>>now.  First go to Measurement Computing (referred to earlier) and 
>>get whatever I/O board suits your fancy, e.g., their USB-1024 
>>($100).  When that arrives, install the Universal Libray software 
>>that comes with it.  Then add the appropriate Declare statements in 
>>the User Script area of your EP program (see instructions that come 
>>with the MCC UL).  Now you can use MCC UL function calls from EP 
>>inline code to send & receive data through the USB port.
>>
>>Recognizing that the MCC UL essentially just adds a DLL to provide 
>>the USB support, with enough ingenuity you could take this even 
>>further by writing your own DLL to use from EP.  For that, you 
>>might want to take a look at "USB Complete" by Jan Axelson.
>>
>>Mind you, I am not advising you do any of this.  Just being an 
>>academic and pointing out the full range of possibilities.
>>
>>-- David McFarlane, Professional Faultfinder

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