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6602 TTL pulse with active state first

I am using NI-DAQ 6.9.x for programing the PCI-6602 timer board
in C++.
I am working in pulse generation mode.
Basic pulses are defined by a first value and a second value,
whereby the first value indicates the number of clock cycles for the
TTL inactive state, and the second value indicates the number of
cycles in active state.

I would like to have active state before the inactive state,
e.g. the first value indicating the active state and the second value
indicating the inactive state.
 
Is this possible?
 
Changing the polarity does not do the job, because inactive state
becomes high.
 
 
 
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