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Can I communicate with a parallel port using the U3?

parallel port matlab

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#1 kgarcia

kgarcia
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Posted 24 July 2014 - 04:45 PM

Hi all,

 

I'd like to send signals from a Mac laptop through the U3 to the parallel port on a PC, essentially using the U3 as a USB to parallel converter. It seems to me like I can just cut open a parallel cable and connect it to the DIO ports on the U3. Is this true? Thanks!



#2 LabJack Support

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Posted 25 July 2014 - 11:12 AM

We don't provide any special support for the PC Parallel Port, but a parallel port is basically up to 17 digital I/O, and the U3-LV has up to 20 digital I/O, so you might be able to control the U3 digital I/O in such a way to transfer data to/from the parallel port.

 

1st you would have to know if the logic levels are compatible with CMOS or TTL.  The U3 digital outputs 3.3V/0V for output-high/output-low, likes -0.3V to 0.8V for an input low, and likes 2.0V to 5.8V for an input high.

 

http://labjack.com/s...uide/appendix-a

 

2nd you would have to know how to use the control lines to latch in bytes of data.  The book Parallel Port Complete might be useful:

 

http://www.amazon.co...g/dp/0965081915





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