I am trying to write a gcode/mcode sequence to do the following:

1. Run a motor on X axis until it hits a limit switch and stops (I'm using a limit switch input on a breakout board to operate an optical sensor).
2. Then dwell for 2 seconds and then activate a relay on Y output for 2 - 3 milliseconds then dwell for 2 seconds.
3. Then activate a relay on Z output for 2 - 3 milliseconds then dwell for 2 seconds and then repeat the procedure again.

Can anyone help as I'm new to the whole Mach3 scene and would appreciate any help.

You are going to find out that MACH3 does NOT have precise time delay control on inputs or outputs.

(;-) TP

 BR549
He may be able to use a macro where a pause command is timed in msecs.
Just a thought,

Mach3 does not always abide by the input Msec loop values (;-) .

Been there done that , (;-) TP