How to send a trigger if I write a Program in LabView

[Taraq]

I am new in this field and I am doing my Master Thesis and its one of the task is to give triggers to biosemi with programing in Labview I have tried for everything under my abilities and still I am struggling to find the solution. In detail, I am working on let say computers  'a' and  'b'  two different computers and I want to give triggers from computer 'a' by programming in Labview via parallel port to a computer 'b'  to a EEG system connected to that computer. I tried to send signals and pulse but it showed nothing on the other computer I am not gettting a simple program to send a trigger like this and thats make me stuck here. I open to al suggestion and if possible for simple sample program.

If some one can help me on this, it would be really supportive for me in my Master thesis.

Thanks

Kamdar 

[Taraq]

I am new in this field and I am doing my Master Thesis and its one of the task is to give triggers to biosemi with programing in Labview I have tried for everything under my abilities and still I am struggling to find the solution. In detail, I am working on let say computers  'a' and  'b'  two different computers and I want to give triggers from computer 'a' by programming in Labview via parallel port to a computer 'b'  to a EEG system connected to that computer. I tried to send signals and pulse but it showed nothing on the other computer I am not gettting a simple program to send a trigger like this and thats make me stuck here. I open to al suggestion and if possible for simple sample program.

If some one can help me on this, it would be really supportive for me in my Master thesis.

Thanks

Kamdar 

[Steve.J]

Are you trying to trigger the Biosemi EEG acquisition program from a different PC that is running a LabVIEW program?  Is the "trigger" to start acquisition or to simply make a time mark on the EEG data?  Please explain you setup in a little more detail.

Also - we now have a dedicated Biomedical User Group at www.ni.com/biomedusers - you may find more help on that forum.

Steve

[Taraq]

I am working on Labview from Computer 'a' in that same computer I am working on acquisition with force transducer. What I want is as soon as Acquisiton starts in Computer 'a' trigger should be sended to computer 'b' biosemi EEG active two device and as soon as it ends trigger should end.

or in other way

I can say is I have sine wave generated from labview in Computer 'a' and as soon sine wave starts, trigger signal should be given to Computer 'b' and as sine wave ends or let program ends trigger ends respectively. I will like to add triggers at Maximum Sine wave value and Minimum sine wave value but Sir for me Start and end is important once if I achieve that with of course others support I would try to develop that.

I hope I explained you clearly and computer 'a' and computer 'b' are connected via parallel port.

Thanks,

Taraq Kamdar

[ABCPrograms]

Hi,

What you could do is using shared variables.  This is like a "OPC variable" and can be used between multiple pc's in a network.

More info on shared variables can be found here (general) or here (applications)

[Steve.J]

Is the Biosemi software able to start and stop acquisition based on a signal on the parallel port?  What other ways (if any) can the Biosemi software start/stop acquisition that we may be able to control from a different PC?

[Taraq]

Sir, I think theres is same kinda prog but without acquisition going on with Computer 'a' and 'b' , the prgraming is done via Presentation First simply I want to go step by step and I want to send a signal pulse and see that are they are connceted and working via parallel port or not and I tried out few things but with no success and i hope I can get some solution from here. 

Thanks,

taraq 

[ABCPrograms]

Taraq,

Have you tried the shared variables?

[Taraq]

Sir, Just trying rite now reading it and trying it . Thankd you very much for this idea....I hope it works. I will update you how it goes on.