Can't figure out how to turn off IHS light

It’s an old machine that ran on Mach3. A driver board was bad so Langmuir said I had to upgrade to Firecontrol and sold me a new enclosure.

where does the IHS port run to ?

There isn’t anything connected to the IHS or THC ports on the box

Thought I’d update, we’ve made some progress. I made a few calls to Langmuir’s support desk and the guys I spoke to were very patient with me. One of the things we did was upload the latest version of fire control, 24.1.3 Beta, I think. After that the green light was still on, so I made another call. This time the guy asked me to look at the G-code for a G38 command, it wasn’t there. He said it should cut, so I tried it and it did! The green light is still there but I can cut, as long as there is no G38 or Z axis commands. My post processor is set up without THC so anything I draw should work ok. Thanks for all the help you guys gave me over the past few days!
Mearl

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Glad you got it to work. That green light will always be on, because the circuit is open without an IHS switch attached to it.