Can I generate KHZ square waveform with USB-6501

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Hello,
Can I use USB-6501 to generate kilohertz square wave form with variable duty cycle for modulating my electronics? If not, what is the economic solution for me? I profer USB interface. Thanks.

[TheWoost]

Hi xshang, The USB-6501 does not have the capability to generate a hardware timed pulse train.  However, a pulse
train could be produced with a digital line and some software timing. 
It would involve toggling a digital line within a loop structure.  In this
situation, the pulse train would of course be software timed, and at
the mercy of the operating system.As an alternative device, our USB-6210 would be a good recommendation.  It is a member of our M Series class of data acquisition cards which can
output a hardware timed pulse train via the onboard clock source.  For more information on this product, please
visit the product page <a href="http://sine.ni.com/nips/cds/view/p/lang/en/nid/203189" target="_blank">here</a>. Regards,Andrew WNational Instruments