You are not specific about the kind of transmission. In general, whether I see 8bits of data as a number or a character lies just in the eye of the beholder. So make sure nothing happens to these 8 bits (Labview does not yet know of 16 Bit characters) and there should be no problem.
Storing characters as SGL (floatingpoint numbers)makes no sense. Characters don't have of decimal points. Use U8 if you do not want to use a string right away.
Gabi
7.1 -- 2013
CLA