Hi Jair,
I'm not sure what version of Labview you are using, so I've tried to answer in a general way.
To find some good Digital I/O examples check the following:
In newer Labview versions, open the Example Finder and go to Hardware Input and Output -> Traditional DAQ -> Digital Input and Output.
In older versions, go to Search Examples -> I/O Interfaces -> Data Acquisition (DAQ) -> Digital Input and Output
If you are using version 7.x of Labview, make sure to only use Traditional DAQ VIs and not DAQmx as your legacy board does not support this.
To find the VIs directly on your functions palette, go to (NI Measurements) -> Data Acquisition -> Digital I/O. Check out Write to Digital Line.vi and Write to Digital Port.vi.
I hope this helps
,
Andrew A
Applications Engineer
National Instruments