daq toolbox with mcc device (USB-3106)

I want to use USB-3106 in MATLAB 2012b. I did "daqregister('mcc')" and completely install. So, I can use "analogoutput", "addchannel" and "putdata". Anyway, my device, USB-3106 provides current output(0 to 20mA and bipolar voltage output(-10 to 10V) and has 16-bit resolution. However, Matlab only provides output 0 to 10V voltage output, and datatype of "uint16". I need to output current delicately. How can I make it in Matlab? Thank you.