how to pause program through input pin?

Hi, HAL noob here.

I'm trying to initiate a program pause in my setup, though one of the input pins.
I have a tb6560 variant, and have already successfully configured a limit/home switch through one of the input pins, so I know they work on the board.

I currently have pin 12 connected to a relay switch, and I'd like the program to pause when the relay opens.
Here's what I've added to my hal file:
net halui.program.pause <= parport.0.pin-12-in
(i've also tried it inverted with 'pin-12-in-not', and it didn't help)

Unfortunately, when the relay triggers, nothing happens.
I'm sure I'm missing something obvious. Is there something additional i need to add to the ini to make this work?

Thanks.

Are you sure that is your exact line? Net format is
net signal pin pin pin and so on.

It would be something like
net pause halui.program.pause parport.0.pin-12.in

could we see your hal file?

I'm attaching my HAL file, but there's no references to that pin in it. I've been putting the changes in the custom.hal file, and it only had that one line.
I thought I needed "net halui.program.pause <= parport.0.pin-12-in" to reference the pause operation to pin 12
I replaced it with "net pause halui.program.pause parport.0.pin-12.in", but then linuxcnc bombs out with:
./custom.hal:6: Pin 'halui.program.pause' does not exist

I know I'm missing something obvious here, as I've only just started dipping into this custom hal stuff.

Great - so I think what you are missing is the

HALUI = halui in the [hal] section of your ini file.

linuxcnc.org/docs/2.6/html/config/ini_co...id_sub_hal_section_a

wow, that was a lot easier than expected. I knew it was something simple.
The past few weeks have been like drinking cnc information from a firehose! But it's oh so satisfying when you get things working the way you want.

Thanks for the help!

New client. I currently comand a hydraulic cylinder to move. Then next line G4 P2.5 then the next line completes the next operation.
In your answer I thought why not use 2p micro, switching states, at end of travel going in to pin 12.

Would the following work???

net pause hauli.program.pause parport.0.pin-12-in ( to replace G4 Pxxxx)
# at end of travel & state change.
net pause hauli.program.pause parport.0.pin-12-in-not (continue program execution)
Dave N.