Hi,
did not study the manual of the MSO5102D, but usually the pattern selection enables you to define the pattern which should trigger the scope. Let's assume digital probe pins D0 AND D4 should both be high, D2 low to trigger the scope, all remaining pins are "don't cares", then you set D0 to H, D4 to H and D2 to L, all other pins to X. That's a comfortable way to trigger the scope with special events on the logic channels.
With my HMO2524 I can use up to 16 channels plus the 4 analog channels and design either an AND or OR pattern as described above, the output of the FF can be set to TRUE or FALSE. Additionally a filter can be specified where the output pulse must meet certain pulse length (minimum, maximum, equal, unequal,....).
Kind regards
Gunb