[surly]

DC Motors with encoders can be used in LabVIEW through three VIs on the "NXT Robotics >> TETRIX" palette.

Move a Fixed Distance : Starts motors running at constant speed with a target encoder count. You can also specify timeout conditions.

Motor Status: Returns the current encoder count and whether the DC controller is in the middle of a move to position command.

Reset Encoders: this ones pretty simple.