Control mass flow controller using USB 3105 (measurement computing)

Currently, we are using USB 3105 measurement computing instead of Ni-DAQ/module card to send the analog outputs to alicat mass flow controller .

I am quite new with labview programming so i do not know how to convert the voltage to the flowrate and send it to MFC. I know the linearly scale but i do not know how to programe it in labview.  

Initially, i need to connect 2 mass flow controller to 2 channel of the USB and control flowrate in conditions: Flowrate of MFC1+ Flowrate of MFC2 = 25 m/min (~2.5V)

I tried to look up googling and youtube. Unfortunately, most of the instructions are using Ni-DAQ card.

Note: We do not want to purchase for RS232/485 connection so using labview(2012 version) is the must choice.

Hope to get a help from you.

Thanks