When you have PIC-1752U IDO card function test request, you may try the following step to have a simple and quick function test. Prepare items: HW: Windows Platform to insert PCI-1752U SW: DAQNavi + PCI-1752U Driver Simple Steps: 1. Install and Open DAQNavi 2. Click Device Test Tap and select output 3. Fill in FF in textbox to turn on all output 4. Select Support Device to check Signal Connection 5. Wire PCI-1752U thru 100 pin SCSI cable to ADAM-39100, and use LED board to test the output function Finally, you could jump back to Device Test Page, and you may find the bug - all output channel show "turn off", but they are actually turning on. This may due to software bug not keeping DO status when switching pages.