Jarrod,
Thanks for your info. I did the following to resolve the issue:
1. Under Windows Device Manager, uninstall Data Acquisition Devices, PCI-6509
2. Uninstall all my National Instruments Software
3. Shutdown and remove my PCI-6509 board
4. Power-up and install NI-DAQmx 8.0 driver
5. Prior to install the board back, check on MAX, it's able to show the NI-DAQmx Devices with not PCI-6509 board detected
6. Shutdown and install back the PCI-6509 board
7. Power-up and Window detected New Hardward and select Install the software automatically.
8. Launch MAX and I'm able to detect the PCI-6509 as well as able to perform Self-Test
But the root cause of why "NI-DAQmx Devices is not found previously? It's due to some features are not installed properly or have been accidentally removed? I'm still play around to see what causing this problem.
regards,
lennon