Digital I/O between EPrime and Biopac

[Cate]

Hi David,

Thanks so much for the feedback!

My parallel port is really at &H378 (888 in decimal).  I have now
gotten Writeport (888,x) to work but I am still unable to read from
port 889 (I get a value of 120 regardless of the TTL input I'm
sending).  This leads me to believe that I either need to include some
code to enable using the port for input, or that my port is not
correctly configured in the BIOS for input.  I checked the BIOS and it
is currently set to ECP mode.  Other options available for selection
are EPP and PS/2.  Would you recommend using a different mode?

Any advice would be welcome!

Thanks,
Cate

On Oct 28, 3:08 pm, David McFarlane <mcfar... at msu.edu> wrote:
> Cate,
>
>
>
> >I am trying to use the ReadPort function to receive a TTL pulse
> >transmitted via a Biopac MP system.  I am using the Biopac STP100C
> >Digital Interface that connects to the PC running Eprime via a
> >parallel port.  In the product specifications, it specifies the pins
> >over which TTL pulses can be sent to/from EPrime.
>
> >Parallel Port interface (uses standard PC printer port with DSUB 25
> >connector)
> >Output from E-Prime: (pins 2-9) connect to MP System Digital I/O lines
> >8-15
> >Input to E-Prime: (pins 13-10) connect to MP System Digital I/O lines
> >4-7
>
> >Using the ReadPort(889) or ReadPort(&H379) commands yields the value
> >120 regardless of whether a TTL pulse is being sent to any or all of
> >the EPrime input pins.  Similarly, using WritePort(888,x) yields no
> >recognized input on the receiving machine regardless of the value of
> >x.
>
> >Any suggestions, especially from anyone who has successfully used this
> >hardware setup, would be appreciated.
>
> >Thanks in advance,
>
> I have never used a BioPac, but here are a few general thoughts on
> the use of a parallel port for I/O in EP.
>
> First, make sure your parallel port really appears at base address
> &H378.  A few computers put the port at a different base address,
> like &H278.  You might find the lpt port base address using the
> Windows Device Manager.
>
> Second, make sure that the parallel port is configured for the proper
> mode and direction.  The BIOS in some computers allows you to
> configure the parallel port as an old, standard ("legacy") parallel
> port, as well as newer bidirectional modes (ECP & EPP?).  If you use
> a bidirectional mode then you must also set the data direction using script.
>
> I ran a search at the PST Forum using the term "parallel port" and
> found the following post which may give you some ideas:
>
> http://support.pstnet.com/forum/Topic1164-8-1.aspx
>
> -- David McFarlane, Professional Faultfinder
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