Thanks for the reply. Yes, I want to decode the digital signal from the 25 pin bus but I can decode it with software if I can get a file where each record is a 25 bit word of voltage values (or can be as little as 14 bits since I don't need all the info contained in the 25 bits) . Each 25 bit word would be the results of the status of the 25 pins during a 720 microsec pulse (results are either zero voltage or a voltage of about 3V). Ideally, I would want to record 15 words consecutively, every 720 microsec and then wait 15 minutes for another series. If I can't record 15 words consecutively, I could gather data over, say 1-2 minutes at whatever rate is possible. However, since the state changes every 720 microsec, the logger would have to be able to read one word that fast.
I hope I haven't confused you more!