what format is accepted for non printable delimiter?

[tooptoop4]

ie hex value or octal value...etc for the UnitSeparator character?

[jqnatividad]

It's not a direct function of qsv, but of the shell you're using.

In Bash for instance:

       \a     alert (bell)
       \b     backspace
       \e
       \E     an escape character
       \f     form feed
       \n     new line
       \r     carriage return
       \t     horizontal tab
       \v     vertical tab
       \\     backslash
       \'     single quote
       \"     double quote
       \nnn   the eight-bit character whose value is the octal value nnn
              (one to three digits)
       \xHH   the eight-bit character whose value is the hexadecimal value HH
              (one or two hex digits)
       \uHHHH the Unicode (ISO/IEC 10646) character whose value is
              the hexadecimal value HHHH (one to four hex digits)
       \UHHHHHHHH
              the Unicode (ISO/IEC 10646) character whose value is
              the hexadecimal value HHHHHHHH (one to eight hex digits)
       \cx    a control-x character

Source: https://superuser.com/questions/163515/bash-how-to-pass-command-line-arguments-containing-special-characters