Cable to send DirectRT TTL signal to a BNC input

[deconroy]

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

[JEC]

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?

[deconroy]

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/documentation/pdf/datasheets/720_730b.pdf (the lab I'm collaborating with on this project is using the DI-730).

David