[edited from a support email:]

I just had a quick question about having DRT send out ttl signals.

I've read the relevant documentation about how to specify the byte value/port location/time, but am having difficult figuring out the port location.

I've read the extended documentation about how to find the address of the parallel and serial port in the hardware profile, but the thing is that my computer doesn't have a serial or parallel port, only USB ports.

I have a USB to parallel adapter so I can interface with a Biopac machine, but I send out at ttl. I've looked for the hardware profile of the USB device in the manager, but can't figure out what the port value would be. One lead is in under Details --> Device Instance
ID. It gives me the following string:

USB\VID_067B&PID_2305\5&18B6E64F&0&3

Not sure if there's an address somewhere in there. So, I'm not sure if you have any suggestions on how to get a ttl signal when there are no parallel or serial ports, but I would greatly appreciate any ideas you have on the matter.