PIN ASIGNAMENTS IN EMC

Hi,
I would like to make the next asignament pins in EMC.

2 Xdir
3 Xstep
4 Ydir
5 Ystep
6 Zdir
7 Zstep
8 Adir
9 Astep
14 Relay 1
16 Relay 2
Home and Limits switches by default

How do you make the above asignament ?
What is the source code file where in EMC is made the mapping?

Pin 14 and 16 must handle two relays for switch on and switch off
Is this possible in EMC in earlier post I understood that this is not
possible.
If it´s possible what gcode switch-on and g-code switch-off.



Thanks in advance