I am trying to start the recording externally with a TTL but unfortunately every time I give the voltage high (~2.6 V) the program crashes.
It writes in the log that it is creating the file and crashes.
Also, is it possible to change the TTL to be in a toggle mode (i.e. one ttl starts and one ends the recording).
I am out of town but I will look into this when I get back. I might have modified something in the firmware that caused this issue... Should be an easy fix.
One thing to note: I have only tested this input with a 3.3V high signal. There is a possibility that a higher, 5V TTL, signal could crash the DAQ PCB. Nikolas, it sounds like you tried lower voltages but just in case you haven't, use a voltage divider to drop your TTL signal down to 3.3V.
As for changing the trigger to toggle mode, this can easily be done but I probably won't get around to add this function for a while. If you are interested in adding this function yourself I can point you in the right direction.