Sending TTL signals to ASL eyetracker (case 16133)

Hi,
I have been trying to send TTL signals from DirectRT on one computer to ASL's EyeTrac 6 on a second computer, to segment the pupil diameter data in sync with the stimulus presentations. The I/O test worked, and the byte value changed, indicating that the ttl signal is being sent. However, when collecting the data the XDAT value does not change from 0 and so I can only get one continuous stream of unsegmented data. I set up the csv file as per the sample but am unsure which TTL and time values are best (as another post stated that TTLs must be brief pulses?).
Thanks!

If you are still having problems and want to upload a copy of your .csv input file, I'd be happy to take a look at it.