If you are just trying to have them in numeric order i.e. A=1, B=2, etc., then here is a simple example. Otherwise
you can build an array constant to provide a conversion table, where you can put them in whatever order you want, then either use the index as your number, or search the 1D array for your char. and the index will be returned. In my attached example, remember that lowercase are different numbers. If you want "a" and "A" to return the same number then remember to put the lowercase to uppercase conversion (found in the string section" in before the string to U8 conversion.
Putnam Monroe
PutnamCertified LabVIEW Developer
Senior Test Engineer North Shore Technology, Inc.
Currently using LV 2012-LabVIEW 2018, RT8.5

LabVIEW Champion