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Thread: Cable to send DirectRT TTL signal to a BNC input

  1. #1

    Cable to send DirectRT TTL signal to a BNC input

    I'm trying to find a cable that can SEND a TTL signal from a computer running DirectRT to an external data acquisition system that take a voltage input (up to 10 mV) with a BNC connection (we do not need to receive any information in DirectRT - we're just marking when stimuli are presented to sync up behavioral and physiological responses). I can go out of my computer via either USB or a 9-pin serial connection, but this overall connection seems to be pretty odd because I haven't found anybody who stocks anything like it. Does anybody know of any retailers who have this type of cable? Any and all advice/comments would be appreciated. Thanks!

    -David

  2. #2
    Join Date
    Nov 2005
    Posts
    294
    That's a tricky one...

    USB cables contain a high speed bus which wouldn't really work for you.

    It would be possible, with some trickery, to get a regular signal out of your serial port. However, it would require an external adapter of some sort.

    Can you confirm that your 10 mV value isn't really 10 volts?

  3. #3

    10V, not 10mV

    Hi John,

    10mV is the minimum input - sorry for the confusion. Does that make the problem any easier to solve?

    There are tech specs for the other DAQ at http://www.dataq.com/support/documen...s/720_730b.pdf (the lab I'm collaborating with on this project is using the DI-730).

    David
    Last edited by deconroy; 11-10-2008 at 10:51 AM.

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