DAQ toolbox to generate output signal and receive two input signals

I'm using a National Instruments PXIe-6363 for data acquisition. I'm trying to send an excitation signal to a power amplifier, using one output channel. That signal excites a coil in an inspection head (Barkhausen Noise Sensor) which returns the Barkhausen signal. I also wired the breakout board to return the excitation signal. So I have a single output channel that I'm sending my generated signal, and two input channels where I take in the two returned signals.

I've managed to identify the device, and opened and named the three I/O channels, and defined my excitation signal. I'm not confident that I didn't mix up which are inputs and which are outputs when using the addAnalogInputChannel and addAnalogOutputChannel commands, and I don't know which one(s) are to use 'Foreground' and 'Background'

Answer 1

[Walter Roberson]

Foreground data collection is used if you want your program to effectively pause while the data is collected (you having configured ahead of time how much data you want to collect.)

Background data collection is used if you defined callback routines that receive portions of the data and process them, and your program can keep running in the meantime.

To distinguish your channels... plot them during testing? See for example http://www.mathworks.com/help/daq/examples/acquire-continuous-and-background-data-using-ni-devices.html