Some parellel port keys work, some don't

[Paul Groot]

Well, it's rather essential to know which pins are being used because
different pins are mapped to different registers (i.e. different
addresses). There are three 8-bit registers: data (base address), status
(base address+1) and control (base address+2). The 25 pins are input,
output, or bidirectional. The directionality of the data pins depends on
the selected mode. For internal ports you can specify this mode using the
BIOS setup, but I'm not sure how you this can be done with ports that are
not integrated on the system board. The 8 data lines (which are mapped to
the base register) are by default used for output only, so they won't
accept any input unless you explicitly instruct the hardware to change its
mode. The nice thing about the new ParallelPort object is that you can use
the GUI to select input or output mode, without any further programming.
There are also other advantages:
http://www.pstnet.com/support/kb.asp?TopicID=1247. If your button box is
not wired to the data lines, then they are probably connected to the lines
that are mapped to the status register (i.e. base address+1). I don't think
you can use the ParallelPort device in this case, so you could simply fall
back to the Port device.


General info about the parallel port pinning and registers:
http://en.wikipedia.org/wiki/Parallel_port
Info about using input lines with the status register:
http://pfcgroot.nl/e-prime/85-tips-and-tricks/71-button-box-on-printer-port.html

best,
paul


On 13 June 2013 18:44, Tobias <tobias.fw at gmail.com> wrote:

> Hey, thanks.
>
> I have E-Studio 2 Professional. I had a look at the control panel for the
> addresses of the parallel port and they are D050-D057 and D040-D047.
>
> In E-Prime I have to specify the port and tried D050 first - which didn't
> work. Then I used D051 and it worked - but only for this one device. Not
> for another one.
> I am not sure which pins/bits the buttons are using each, but it may be
> that the one device uses one different from the other device. I would like
> to tell E-Prime to use the entire port.
>
> I don't know how to sepcify the port mode. I don't know the difference
> between ParallelPort device and plain Port device.
> All I know is both devices I have here have 25 pins and 8 of them should
> be used to transfer the data, right?
>
> Best,
> Tobias
>
> Am Donnerstag, 13. Juni 2013 12:22:29 UTC+2 schrieb Tobias:
>
>> Hey there,
>>
>> I am using parallel port for response collection. My port ist &HD051 and
>> I set a test slide to be terminated by ANY response made with the parallel
>> port keys. That works fine with one device, but with another device id does
>> not work at all.
>> Of course you may think that maybe the other one is broken. But a
>> collegue of mine who is using "Presentation" software can use both just
>> fine.
>>
>> Any hint?
>> Best,
>> Tobias
>>
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