Hi, I'm new here

[paulus.v]

Mach3 was designed to work with the parallel port. There the pins are straightforward, numbered from 1 to 17 and if there is one parallel port it is port 1.
With the USB and ethernet controllers, the inputs and outputs need to be emulated so that mach3 thinks there's one or more parallel ports. Each controller manufacturer can assign what port and pins number they want to their inputs and outputs. For example the CSMIO IP-M controller uses the port 10 in mach3, if I remember well.

edit: So the manufacturer should provide for each input and output the corresponding pin and port to be assigned in mach3.