Unused ASCII Values
Only 64 characters are needed to represent all possible combinations of 6 dots Braille (including space), so not all ASCII values are needed for Braille ASCII.
The lower-case letters (a to z) are not normally used, but might be interpreted as having the same dot patterns as their upper-case equivalents. `, {, |, and } are not used and their Braille ASCII rendition is not defined.
Braille ASCII is merely a subset of the ASCII table that can be used to represent all possible combinations of 6-dot Braille. It is not to be confused with the Computer Braille Code, which can represent all ASCII values distinctly.
Read more about this topic: Braille ASCII
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