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Hi Roger

I assume you're trying to do this under Windows. If so, try the following

http://neil.fraser.name/software/lpt/
http://www.kemo-electronic.com/en/module/m125/
http://electronickits.com/kit/complete/elec/ck1601.htm

If none of these do the job for you, you can probably find more at the
Parallel Port Central ( http://www.lvr.com/parport.htm ).

Cheers,

Beat


At 21:35 02-08-2005, you wrote:

>Search the CONFOCAL archive at
>http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal
>
>List readers,
>I need to control AOTF line selection by sending 4 TTL signals,
>probably via the printer port (just off or on; I have software that
>will control the amplitude).  Currently I am using Axiovision to
>control the microscope and it does not seem to have any facility for
>sending additional TTL signals.  I need a tempory solution until I can
>get an appropriate integrated aquisition software system.  Can anyone
>suggest a public domain or very cheap utility that could send these
>signals?  Can ImageJ do this?
>Thanks for your thoughts,
>Roger
>
>Roger Phillips
>Sussex Centre for Advanced Microscopy
>University of Sussex
>JMS Building
>Falmer, Brighton & Hove
>UK
>
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