If you have a parallel port that is available, you can use a VI that can control bits on the parallel port. I downloaded this VI from NI's website, and it worked just fine.
Download the VI at http://www.advmeas.com/helpfulF.htm
Also, you have to add the line
serialDevices="COM1;COM2;COM3;COM4;COM5;COM6;COM7;COM8;COM9;\\.\COM10;LPT1;LPT2;LPT3;LPT4"
to your labview.ini file.
You can also read on how to use this port for input at http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/953a4ab52663089d85256427004778c4?OpenDocument
Mark
