DirectRT TTL pulse to Biopac Acknowledge for Batch Acquisition (case 11357)

I am just starting to use DirectRT and Medialab for my research and facing issues regarding setting up DirectRT to send a TTL pulse to the Biopac (MP36) machine so that Acknowledge can start a batch acquisition. I have read through the manual and not sure how to program DirectRT. Here is a my research design:

I am showing 8 different images, each timed for 60 seconds. After each image, participants will answer questions related to the image. I plan to use Medialab for the questions and DirectRT for image display so that the TTL pulse can be sent through DirectRT. My study design would require a TTL pulse to be sent both at the onset and offset of the image exposure so that acknowledge knows when to start and stop recording.

If anyone can help with how to write the file DirectRT for this, it will really help me. Being such a novice, I am really not able to figure things out.

If you haven't already, I would look at the Other Features > TTL signals section of the DirectRT manual and the example in the \DirectRT\samples\5 other features\13 ttl signals folder.