Limit digits on number entry

I am in the process of writing a driver for some hardware and I am not sure how to do something.
There is a timing parameter that can a adjust a couple of different things, and the format of the string commnd looks like RDVALXXXXYY.
The string is build with 3 user controls, one is a menu ring that picks the "RDVAL" out of a list, the next one is a number control that has to be 4 digits long (no more, no less) and the last one is another number control that needs to be 2 digits long, no more, no less.
I could just make instructions that describes the fact that the numbers have to be a certain length, but I need a way to require the numerical control to only accept a 4 digit number (and a 2 digit number in the other case).
Solved!
Go to Solution.

Configure your numeric controls as follow:
  this max number is FFFF
Do something similar for the 2 digits input
Ben64

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