how to convert a number into an ascii code

Hi,:
I just start to use Labview. i plan to use the labview to talk to Rs232. here is my question:
i have unsigned 8 bits number, i plan to convert the number into a letter so that i can send it to RS232. for example, i have unsinged number 85, i want to convert it into "U" since "U" is the corresponding letter of ascii code 85,

can you please tell me how i should do it,

thank you,