got  a g540 and mach3 hooked up with 3 steppers, Terminal 1,2,3,4 and 10 are grounded.  (simulating home and estop switches)  . Mach 3 is setup and sees the home switches.  ( Port 1, pins 10,11,and 12 )  The problem is with the e stop.  I set up Mach3 ESTOP input to port 1 and pin 15.  Is this correct.  Mach 3 will se the estop but can't reset the g540 unless I use port 0 in Mach 3  ( which dissables it ) .  If i put LOW  true on the ESTOP  input I can get mach3 to clear the red LED on its Diagnostics displat (Emergency LED) .  If I dont use the estop input I can clear the errors and get the G540 to go green ( no fault ) and get motors to run.   I can then pull the estop ground on the G540 and get a fault.  So it works on the G540.  But the question is how do i get an ESTOP error to show up on Mach 3  as an Emergency LED on the daig screen.  Port 1 pin ??.

my problem is how to get rid of the estop error mach3 ss hobbycnc xyz axis limit switches in series going to pin 11

Are you referring to false triggering of the EStop ?

Tweakie.