I believe I may have sent you an e-mail about this. However, I would be glad to post about it here as well.
Full-duplexing is not a term we commonly associate with our DAQ boards. It is usually used in reference to serial-type communication that can go both ways at the same time (such as a modem). The best answer I can give on this is that the 6025E you asked about has 3 additional DIO ports (PA, PB, PC) which can operate in Bi-Directional Mode. This allows them to function as both inputs and outputs. The 6025E User's Manual is the best place to find more information about this.
Ross C
National Instruments
