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Have a look at the halui.program.* halpins:
linuxcnc.org/docs/html/man/man1/halui.1.html

Depending on the gui you are using it may provide its own hal pins to steer program execution.

You need only to lower the voltage a little bit for the Level-Shifter with a Diode or two Resistors,
the FPGA can handle up to 3.3V input and the Level-Shifter need to detect 1.8V as high.

but after applying G54 on X, it becomes a mess:

This issue is a known limitation of the feature. Please read paragraph 11 the documentation I posted above.

I hope this video will make more clear what is happening, I have no issue with g-code from CAM, machined parts are ok, only display section is a bit off in my case:

Hello, i am new to the linuxCNC systems.

I wish to build a simple rotating axis controlled by linuxcnc gcode. And i have a external robot which would perform some machining operations on the rotating part.

Now i want to sync both the machines. such that when i start the robot, the linuxcnc should also start executing the gcode.

Is it possible to execute the gcode when an input is provided through one of the parallel port input pins?
does the M66 code work here?
how to then pause the program if i pause the action of the robot (incase i have to e-stop the robot) and how to make sure then that the gcode is resumed from the paused location once the robot restarts and sends execution trigger to the linux cnc.