Hello Nicolas,
Thank you for your question regarding a DAQ-500 card. It sounds like you're having problems getting the card to operate in differential mode. Is your device perhaps a PCMCIA DAQCard-500? If so you should be able to use four analog differential inputs. Where is the problem occurring in MAX? Can you right click on the DAQCard-500 in Traditional DAQ Devices >> properties >> AI and then go to mode and select Differential there? If the device is indeed the DAQCard-500 shown
here and the problem hasn�t been solved you may want to try to reinstall the card.
Other resources can be found on the ni.com website by clicking the support tab at the top of the home page. Then search from Technical
Resources at the top of the page for your topic. I hope these resources help! Let me know if you need any other support with this issue.
Shea C.
Applications Engineering