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Read Mark out
START
Fired (low)?
Yes
No
Light LED (“Mark”) and
set Mark TRIG low
Read Space OUT
Fired (low)?
Yes
No
Extinguish LED (“Space”)
and set Space TRIG low
Read Mark OUT
Ready (high)?
Yes
No
Set Mark TRIG high
Read Space OUT
Ready (high)?
Yes
No
Set Space TRIG high
Wait for Mark OUT to fire
START
Light LED (“Mark”) and
set Mark TRIG low
Wait for Space OUT to fire
Extinguish LED (“Space”)
and set Space TRIG low
Wait for Mark OUT to show ready
Set Mark TRIG high
Wait for Space OUT to show ready
Set Space TRIG high