Meter Signaling would like to know the specifics of.

[infringer]

First off I would like to introduce myself as someone who works in this field and say hello to all.
After working with this stuff I have become a bit curious on the more in depth specifics of arcade operation which has lead me to this question and hopefully someone can help.

Next to let you all know I did search through the forums a bit for an answer as well as look at the bookmarks yet I haven't found an answer.

I am curious with the signal for the hard meters in a game.

I know that 12v runs the meter and the black wire detects your pulse on the meter side but I am curious about the signal going to the meter.

What is the specifics of the pulse and is there a standard that it follows of communications that this pulse follows such as say 1wire communications bus?

I am curious on the pulse it is important to me as to how this works exactly obviously it is a signal but I would like to know what type of signal and how it is given if it is a simple analogue signal or a digital signal or a signal through I2C or 1wire etc...

There does not seem to be much info on the pulse that the meter reads other than it is a high state or a low state but many things could set that state.

I am guessing it is an analogue signal but what are the specifics of the signal is it a voltage drop or spike and it must be fairly standard so what voltage does it drop or rise to if that is the case? It would be nice to find someone who knows the specifics of the out and in meter signaling.

It seems to follow a specification as meters seem to be fairly universal with some exceptions.

Anyhow enjoy and thank you all for reading and responding in advance!