George,
the PCI-6025E doesn't provide buffered DIO operations, too but it provides a handshake mode. Are you looking for handshaking or clocked DIO operations?
The
DAQCard-6533 provides both operation modes but it's a mere digital I/O board. If you are looking for a multifunction DAQ device with clocked DIO lines you could have a look at USB devices like the
NI USB-6251 or a modular
cDAQ device. The latter option provides direct connectivity to a big range of industrial signal types.
Please let me know if you have further questions.
Best regards,
Jochen Klier
National Instruments Germany