Hi egatjens,
With the traditional daq drivers you can use the AI_Configure function to set the inputmode for the analog input channels. Full documentation of this function and how to use it can be found in the Traditional NI-DAQ C Reference Help. This should have been installed along with your NI-DAQ drivers. It can be found under Start»Programs»National Instruments»NI-DAQ»Traditional NI-DAQ Reference Help or at <National Instruments Install Path>\NI-DAQ\docs\nidaqpc.chm
I hope this helps.
Thanks
Nathan
Nathan
NI Chief Hardware Engineer