Redpower Bundled Cables Usage

I'm trying to make a simple code to check into a bundled cable, if the in put is on, turn it off and vice versa. The thing is, if i have lots of programs like this, i need them not to interfere.

Can i please have a basic code idea, or even just more in-depth usage examples then whats under help redpower.

THX!

My current code is attached, it says "attempted to call nil" when i run it.

You have a typo in your code.
The second to last line has "budledOutput". It's missing the 'n'.

Every time you receive "attempted to call nil" it's good practice to check if you've mistyped a function name somewhere. :P/>/>