microlaser,
The 6602 uses the same digital controlling chip, the DAQ-STC as our E-Series devices. Thus the examples that work for E-Series devices will work for your 6602. You did not specify the language you are programming in, but here is an example that allows you to configure the line direction independently in LabVIEW.
http://sine.ni.com/apps/we/niepd_web_display.DISPLAY_EPD4?p_guid=B45EACE3DDD956A4E034080020E74861&p_node=DZ52318&p_submitted=N&p_rank=&p_answer=&p_source=External
Kevin R
Applications Engineer
National Instruments