Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: DuaneO on June 07, 2011, 11:21:08 PM

Title: Identifying which "pull up" pins to use for limit/home switches
Post by: DuaneO on June 07, 2011, 11:21:08 PM

How do I know which pins to pull up for my limit/home switches?  I am very new to MACH3 and am trying to wire my limit/home switches but do not know which pins to use.  I have all of my 3 axis (X,Y,Z) working but no switches attached.  I do not know who the mfg. of my board is and there is no name on the board.  Any help would be great. 

Thanks ahead for the help.

DuaneO

Title: Re: Identifying which "pull up" pins to use for limit/home switches
Post by: Peter Homann on June 08, 2011, 12:11:58 AM

Duane,

The only input pins on a parallel port are 10,11,12,13 and 15. The rest are outputs. That said you can configure Mach3 to set pins 2-9 on the 2nd parallel port to inputs as well, but that's not applicable if you are using just the one port.

So, you should be able to use any of these assuming that they are not already being used. On some setups the Mach3 Estop input is set to pin 10 or pin 15.

Have a look at Engineering note EN0098 on the following  page. It shows how the limits are set up on my MB-02V6 breakout board and gives a table of the parallel port pin assignments.
http://www.homanndesigns.com/store/index.php?main_page=page&id=3

Note that you can just daisy chain the limit switches rather than a separate input for each switch.

Cheers,

Peter.

Title: Re: Identifying which "pull up" pins to use for limit/home switches
Post by: DuaneO on June 08, 2011, 02:15:28 PM

Peter,
  Thanks so much. I will do some more research tonight.

Duane