Hello Raha,
When you configure the input configuration (Differential, RSE, or NRSE), the input range of the board doesn't change. The input range is a characteristic of the analog to digital converter and input circuitry where as the input configuration only changes how the measurement is taken. This means you’re signals should always be in the +/- 10 volt range.
Differential measures the voltage difference between the two input lines. RSE measures the voltage of the input line relative to the DAQ card's internal ground; you connect the negative input of your signal to the cards ground to give the voltage a reference. NRSE uses the negative input of your signal as the ground reference and ignores the DAQ card's ground; you connect the negative input of your signal to the AI SENSE terminal.
For more information on these input configurations and when to use each please see these articles:
Data Acquisition: Checking Your Board Settings - Analog Input Mode
Field Wiring and Noise Considerations for Analog Signals (in particular Table 1 in section 3)
In order to read back particular setting on your DAQmx task you can use DAQmx Property Nodes. Depending on which property you want to read back you may need to use a different node (either DAQmx Channel, DAQmx Read, DAQmx Write, etc.). In general most "configuration" settings, meaning the values you set with the DAQmx Create Channel VI, are available in the DAQmx Channel Property Node.
Cheers,
Brooks
