NI USB-6212 digital output

Hi there,

I am using a the USB-6212 board and I would like to generate a task in order to create a digital square wave at a given frequency (400 Hz). My problem arises from the fact that NI MAX only allows me to use only a software timed timing for such task. Did I miss something? Should I use the output from a counter of my board in order to generate a digital square wave?

Thanks.