National Instruments NI 9401 - Manual (Page 12)

NI 9401 Operating Instructions and Specifications 12 ni.com
Specifications
The following specifications are typical for the range –40 to 70 °C
unless otherwise noted. All voltages are relative to COM unless
otherwise noted.
Input/Output Characteristics
Number of channels.......................... 8 DIO channels
Default power-on line direction ........ Input
Input/output type............................... TTL, single-ended