Hello;
To introduce a delay in between the restart of generation, you will need to work with another board together with the 6534.
You can use even a low cost E-series board and use the general purpose counters available on those to generate the delay. Also, one of the counters will need to generate the pulse tran that will be wired to the PCLK line of the 6534.
Hope this helps.
Filipe A.
Applications Engineer
National Instruments