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two digital triggers

Hi!,
 
I´m in need for a little help. My problem is that I´dont know is it possible to use two digital triggers simultaneusly in 6225-daq. I try to do two same tests at same time. PFI4 line should be as a trigger for a line ai20 and PFI5 should be as a trigger for a line ai52. PFI4 and PFI5 lines get rising edges almost simultaneosly but, you can´t be sure which one happens first.  
 
Program should be able to tell if PFI4 and/or PFI5 lines get rising edge at all. If example PFI4 line gets rising edge and PFI5 line doesn´t,program needs to acquire data from ai20 when PFI4 rises. if PFI5 line doesn´t rise in 0,5 s program should not acquire data from ai52 and it should give for example boolean value or something so you can write to file that test to this other device failed.
 
I can use digital triggers and all is just fine when I get rising edges to trigger lines but when not, program falls.
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