Aristotig 255 foot pedal

Does this older TIG use a normal potentiometer style footpedal or is it also canbus?
I am hoping the older ones are conventional.
Would it be easy to use a cheap chinese footpedal for it?
I object to paying silly money for something so basic.

 

Just simple potmeter and switch. But use the correct value of potmeter (2K5)

 

Thanks very much for that - will have a bash at making my own or modifying one.