How does one output a rectangular train on USB-6009 digital pins that has frequency of 10 KHz or higher?

Hi,

I've got a USB-6009. I'd would like to use a digital line to output blocks of 25 rectangular pulses with max period of 100us and 50% to 75% duty cycle. The spacing between the blocks needs to be 60us or longer. This is what I tried, but it gives me a period of 2ms (500Hz). 

I wonder if the USB-6009 is even capable of reaching 10KHz on it's digital outpu lines and if so what do I need to change in my VI to get such a rectangular pulse train.

Any help and advice would be greatly appreciated

Cheers!