I looked at this too, and posted this explanation of how the inputs and outputs work. You can't put 12V on the input because it's already at that level, you need to connect the input to ground to bypass the 12V pullup.
I looked at butchering the board (which I really don't want to do) so you can feed in the 12V externally but it'd be more complex surgery than I'm willing to undertake. Another option would be to use an external relay board (for infrequent switching) or solid state relay to convert the PNP -> dry contact.
I looked at butchering the board (which I really don't want to do) so you can feed in the 12V externally but it'd be more complex surgery than I'm willing to undertake. Another option would be to use an external relay board (for infrequent switching) or solid state relay to convert the PNP -> dry contact.