**CIGAL Reference Manual, Chapter 7 (Hardware): NIDIG**

=====NIDIG - National Instruments digital I/O interface =====

 **usage: init nidig boardnum revpol nbits nports doutbits **

CIGAL supports National Instrument's NIDAQ-MX library interface capable of controlling a variety of NI data acquisition devices.  There are separate INIT commands for configuring analog ([[jvs:cigal:manual:chapter7:nidig|NIADC]]) and digital (NIDIG) communication settings.

The INIT NIDIG call expects the following arguments (default values in []):
  * boardnum [-1] - the device number (this is required)
  * revpol [0] - bitmask to reverse polarity of selected data bits
  * nbits [8] - number of bits per port
  * nports [1] - number of ports
  * doutbits [0] - bitmask indicating which data bits are for output (rest are input)

You can also access some NIDAQ library routines directly in CIGAL using the PRIMITIVE command.  A description of the NIDAQ primitive functions can be found in [[jvs:cigal:manual:chapter7:niprims|NIPRIMS]].

**See Also:**\\
[[jvs:cigal:manual:chapter7:nidig|NIADC]],
[[jvs:cigal:manual:chapter7:niprims|NIPRIMS]],[[jvs:cigal:manual:chapter2:initialize|Initialize]],
[[jvs:cigal:manual:chapter1:configure|Configure]]

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