How do I get MATLAB to output a digital marker via the parallel port to Biopac's Acqknowledge software?
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I'm basically using MATLAB in place of E-Prime/Superlab/DirectRT etc. In order to mark Acqknowledge (Biopac) with a digital marker (and trigger acquisition), I require the STP100C - This module would accept a digital marker via the parallel port. Therefore, I need to program MATLAB to output a digital marker via the parallel port of the computer, I'm sure there must be some command for that.
I am trying to collect Event Related Potentials and I have 2 targets/stimuli (T1 & T2). These are letters that are part of a rapid serial visual presentation. After each string is presented, the participant has to reply yes/ no to whether T1 or T2 was presented. As far as physiology is concerned I am measuring the onset of the P300.
采纳的回答
Take a look at "digitalio" in the Data Acquisition Toolbox. Here's a short example code:
% Initialize 2 lines (2nd line reserved for future use)
ppobjects.dio = digitalio('parallel', 'LPT1');
ppobjects.lines = addline(ppobjects.dio,1:2,'out');
% Set line 1 to high
linenum = 1;
value = 1;
putvalue(ppobjects.lines(linenum),value);
% Set line 1 to low
linenum = 1;
value = 0;
putvalue(ppobjects.lines(linenum),value);
4 个评论
sonia
2013-3-27
PT
2013-3-27
The initialization code should be placed near the beginning.
When you need to send a brief pulse of digital-high, do a
putvalue(ppobjects.lines(1),1);
pause(0.050);
putvalue(ppobjects.lines(1),0);
This will generate a 0.050 seconds long digital-high pulse.
sonia
2013-3-29
PT
2013-4-1
In that case, wire line 1 and gnd of parallel port to the signal and return on your device's digital input. From Wikipedia, it should be pin 2 or 3 for + and any of the gnd pins for -.
更多回答（1 个）
steamrice
2020-1-28
0 个投票
I am haveing a similar software and hardware design problem using biopac and stp100C. Could someone help?
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