National Instruments NI 9401 8-Channel TTL High Speed Digital Input/Output

National Instruments NI 9422 8-Channel 24V Sinking/Sourcing Digital Input

National Instruments NI 9421 8-Channel 24V Sinking Digital Input DSUB

National Instruments NI 9421 8-Channel 24V Sinking Digital Input

National Instruments NI 9472 8-Channel 30V Sourcing Digital Output

National Instruments NI 9423 8-Channel 24V High Speed Sinking Digital Input

* National Instruments NI 9472 8-Channel Sourcing Digital Output 24V

National Instruments NI 9375 DSUB 16-Channel 24V Digital Input / Output