Display continuous USB data from a force transducer

[bree]

Hi all,
I'm currently trying to input data from two force transducers into E-prime 
so that it will display on the screen in real time.  The task is a pursuit 
tracking task where a subject is using a finger force to trace a line that 
goes up and down as it progresses across the screen.  I'd like to be able 
to display the force as a cursor or a line across the screen in real time. 
 The force transducers are input through a National Instruments box into 
the USB port on my laptop.  I've tried adding a port, and I've tried adding 
a joystick to the devices, but I can't figure out how to tell E-Prime what 
to do with the USB input.  There should be 12 inputs, the xyz magnitudes of 
each force, and the xyz torques of each force.  I'd only need to plot one 
of them, the z magnitude, but I'm not sure how to tell E-prime that.  Which 
device should I use, and if I need to do some visual basic coding which 
functions should I start with?

I hope that makes sense.
Thanks,
Bree

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