NI cRIO-9411 6 channel Differential or TTL Digital input

National Instruments NI 9401 8-Channel Digital Input/Output Module

National Instruments NI 9411 6-Channel Differential TTL Digital Input Module

National Instruments NI 9375 DSUB 16-Channel Digital Input / Output Module

National Instruments NI 9403 with DSUB 32-Ch TTL Digital Input/Output Module

National Instruments NI9425 Sinking Digital Input Module

National Instruments NI-9401 cDAQ Digital Input / Output Module

National Instruments NI 9375 cDAQ Digital Input / Output Module 32ch DIO D-Sub!