Lpt3 port address running errors

[neuro...@gmail.com]

Hello,

I apologize ahead of time - a lot of this technical information and jargon is new to me, which may be obvious in my question. I am using a dual port setup in order to send feedback-locked triggers to an EEG acquisition computer. The original task that we're using was programmed on a lab computer that had the common Lpt1 port address (&H378). We're now trying to run the task on a new computer that has an Lpt3 port address (listed as E010-E017). I've tried to run this using the different methods, using hexidecimal/decimal variations and combinations, but nothing seems to be working.

Has anyone ever come across a similar situation? Any helpful tips or advice would be much appreciated.

Cheers,

Nick

[ben robinson]

I wound up having to use an old computer in order to send signals via parallel port, as new parallel ports use dynamically assigned port addresses, and as far as I could determine there is no way to determine the specific address that will be used at any given time. I realize how far fetched that sounds, but that was the best information I could gather.

ben

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[Ryan Whitfield]

If anybody is running into this issue, E-Prime 2.0 sp1 allows you to reference the parallel port by the LPT value, rather than having to reference the hex address. The use of the hex address presented some problems with dynamically assigned values in older versions, as well as hex values that were greater than an integer (32768). I recommend upgrading the sp1 and using task events for port communication whenever possible.

Ryan Whitfield

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[neuro...@gmail.com]

Thanks, Ryan and Ben for the reply,

I actually tried changing it by the Lpt value first (see below) and when I initially went to change the port address I updated the refernce from "Writeport Lpt1%, x" to "Writeport Lpt3%, x" but this didn't seem to take either. Does the format remain unchanged or am I missing something here?

And are the x values (those specified after the Lpt port number) in a hexidecimal format? I'm wondering how the values below (i.e., &H2A, &H2C, etc.) translate into integer values when communicating with our acquisition software:

If fb2type=0 Then

Writeport LptPort3%, &H2A

ElseIf fb2type=1 Then

Writeport LptPort3%, &H2C

ElseIf fb2type=2 Then

Writeport LptPort3%, &H2E

ElseIf fb2type=3 Then

Writeport LptPort3%, &H30

End If​

Thanks -

Nick

[Ryan Whitfield]

Nick,

Again - sticking with the use of some of the newer features in E-Prime 2.0 SP1, you can use the following script to send the same values, as long as the ParallelPort Device is added to the experiment, changed to LPT3, and the data port is set to "output" (all of this is in the ParallelPort Device Properties)

If fb2type=0 Then

   ParallelPort.WriteByte 42

ElseIf fb2type=1 Then

   ParallelPort.WriteByte 44

ElseIf fb2type=2 Then

   ParallelPort.WriteByte 46

ElseIf fb2type=3 Then

   ParallelPort.WriteByte 48

End If​

I hope this is helpful.

To view this discussion on the web visit https://groups.google.com/d/msgid/e-prime/7e2206f0-3481-4922-9544-e9c72a1821b7%40googlegroups.com.

[Amy Winecoff]

Hello,

I'm having a similar issue. I have added the port to my experiment using the name LTP3 and the address as &HE10. In my experiment, before each time the script presents a picture stimulus, I have an InLine script that reads WritePort &H0E10, x (with x being 2-5 for the different conditions). This runs without an error in EPrime, but the system I am trying to send the pulse to (BIOPAC MP150) doesn't pick anything up. How do I know if EPrime is successfully sending the pulse? 

Also, I would attempt pasting in the script suggested by Ryan W into the InLine objects instead of my writeport codes; however, I don't understand what fb2type means. Is this something particular to the previous user's experiment? Sorry for asking such basic questions, I'm just really new to this.

Thanks!

Amy