2 duet wifi boards Fan output directly to Endstop input

Hi
I s it OK to wire directly Fan output on Duet wifi to Enstop input on other duet wifi in order to use it as a trigger on the second 
I don't think so. The fan output would be the voltage of the PSU and the endstop would be expecting much lower. It would only be safe to do if you could ensure the endstop is only getting a low voltage.
I think the endstops are max 8v tolerant on recent revisions. Though I'd personally want to keep it to 3v as it would normally expect for an endstop.

@phaedrux ```
;G4 S0.5
G92 Z8
G90 G1 Z1 F10000
G1 Z2 F100
G1 Z1 F6000
G1 Z3 F100
G1 Z2.5 F6000
G1 Z4 F100
G1 Z3.5 F6000
G1 Z5 F100
G1 Z4.5 F6000
G1 Z6 F100
G1 Z5.5 F6000
G1 Z7 F100
G1 Z6.5 F6000
G1 Z8 F100
G1 Z7.5 F6000
G1 Z9 F100
G1 Z8.5 F6000
G1 Z10 F100
G1 Z9.5 F6000
G1 Z11 F100
G1 Z10.5 F6000
G1 Z12 F100
G1 Z11.5 F6000
G1 Z13 F100
;G1 Z12.5 F6000
;1 Z13 F100
G1 Z8 F5000 
I don't understand what I'm looking at there.