This is how I have mine....
Pansat--------------->diplex----------------->other diplex---------------> diseqc----------------------->dish
I also did this once....
Pansat--------------->diseqc-----------------> diplex---------------> other diplex----------------------->22 khz----------->dish
and
Pansat--------------->22 khz-----------------> diplex---------------> other diplex----------------------->diseqc----------->dish
As long as the diplex are in order is should work. Putting a diseqc in the middle of them would not work and make little sense.