cosw,
When using the Test Panels in Measurement and Automation Explorer (MAX), the LEDS will probably all be red by default. If you connect a TTL compliant signal to the Digital lines and toggle back and forth between 0 and 5V, then you should see the LEDs turn on and off.
To verify that these lines are working, you may want to try setting them as outputs in the test panel, and use a multimeter to determine if they toggle between 0 and 5V when you change the logic level in the test panel.
If they do not change, and other lines on the board do work, you may want to click on the Support Tab at the top of the screen and choose to 'Phone NI' for additional help, and to discuss the possibility of getting your board repaired if necessary.
Regards,
Jed R.
Ap
plications Engineer
National Instruments