Synchronise digital pattern output(6533) with a external signal

[sl]

I use a PCI-DIO32HS and i want to synchronise an output pattern with an external signal(TTL;T=1.7ms).
ie :every time external signal become high(every 1.7ms)
my dio32HS output a define pattern on a line.
How can i do this?Thanks

[tnewton]

Wire your clock signal to the REQ pin for the group you are using. By default, the pattern is updated on the rising edge of REQ.

[sl]

Thanks for your answer but see attached file to see what i want to do.
I want to control delay between trigger(input signal T=1.7ms) and ouput and control the width of the ouput pulse
Best regards