what bin to ascii are you talking about?

if that bin to ascii routine was meant to convert numbers probably it has been rigged to deal only with characters 0-9 and A-F

in your example, 0x4f (decimal 79, letter "O") has been converted in two separate characters. Looks like a routine that I sent to the code library.

"Z" is 0x5A and using a routine like you mentionated will be translated to 0x35 and 0x41

in binary you don't have A to F. you have 0 and 1. in hexadecimal you have 0 to F and with these numbers you can represent any arbitrary number, as in any other numerical base.

it seems that you are mixing up things. what do you want to do?