Quote Originally Posted by elegizer View Post
I'm trying to trigger Biopac using MediaLab that are both installed in a single Laptop computer.
I've tested that TTL test can send signal to Biopac, and Biopac's software successfully read TTL signals as I send them from TTL test.

Although, I was able to check that Biopac can receive and display the TTL signals at channel 8, auto-triggering was not activated by TTL siglnals.

Is this problem related with your finding that parallel port signals of laptops are not strong enough? Is there any solution to solve this issue? Parallel ports on Laptop computer is added via pci express slot. Let me know if you have specific information about this.



Thank you.
So just to confirm: Your single computer has TWO parallel ports installed. You can send data from one to the other, and the data is received (albeit, in manual mode). If that is true, it sounds like DirectRT is behaving properly.

Can you also send codes from within the DirectRT experiment? IE, run the experiment as usual, and set Biopac to 'port monitor' or 'debug' mode, or something similar? That way, we can confirm that data is being sent during your experiment as well.

I'm not sure how Biopac handles auto-trigger. Can you post a link to their instruction manual? Perhaps there is a setting that's not quite right.

John