You could download and install a trial copy of DirectRT 2014 first to see if this works. Just download a copy from the Empirisoft download page here: http://empirisoft.com/Download.aspx?index=4. Send the 14-character D-code to me at support@empirisoft.com and I can get you a free 21-day trial code.

Using DirectRT 2014, you can set up a DirectRT .csv input file to send ttl signals as normal (see http://www.empirisoft.com/directrt/h...tl_signals.htm). It doesn't matter what you type for the port address in the loc cell or the number in the time cell after the stim cell with ttl: in it.

This is because you will include a .txt file named comport.txt in the same folder as the .csv input file you create. DirectRT 2014 will ignore the values in the loc and time cells as long as the comport.txt file is in the same file folder as the .csv input file that wants to send ttl signals.

When you create your comport.txt file, you will need to define the the proper number to reflect the comport you want the computer to use to send the ttl signal. This is based off of the same functionality in MediaLab used for sending and receiving data over serial ports (for an explanation and example of the comport.txt file see http://www.empirisoft.com/medialab/h...s_features.htm).